diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 19440b0..d8e5e7d 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -7,7 +7,7 @@ on:
   push:
     branches: [main]
   pull_request:
-    branches: ['**']
+    branches: ["**"]
   # Allow manually re-running the check from the Actions tab.
   workflow_dispatch:
 
@@ -28,7 +28,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: ['24.14']
+        node-version: ["24.14"]
 
     steps:
       # persist-credentials: false keeps the GITHUB_TOKEN out of .git/config, so a
diff --git a/CLAUDE.md b/CLAUDE.md
index 46c2c85..b1ca6bd 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -23,19 +23,21 @@ IMPORTANT for AI agents: Do NOT run `gro dev` - the developer will manage the de
 
 - Svelte 5 - component framework with runes
 - SvelteKit - application framework with static adapter
-- fuz_css (`@fuzdev/fuz_css`) - CSS framework and design system
+- fuz_css (`@fuzdev/fuz_css`) - semantic-first CSS framework and design system
 - fuz_ui (`@fuzdev/fuz_ui`) - UI components, theming, docs system
 - fuz_util (`@fuzdev/fuz_util`) - utility functions
 - fuz_code (`@fuzdev/fuz_code`) - syntax highlighting
 - Gro (`@fuzdev/gro`) - build system and task runner
-- prettier + prettier-plugin-svelte - code formatting
+- tsv (via Gro) - code formatting
 - mdz (`@fuzdev/mdz`) - markdown preprocessor wired into `svelte.config.js`
 - `@fuzdev/tsv_wasm` - tsv's formatter + parser as WASM; powers the playground, loaded lazily in the browser
 
-Note: `@fuzdev/tsv_wasm` is loaded only on `/docs/playground` via a browser-only dynamic `import()`, so the ~900KB WASM never weighs down `/docs` or the prerendered pages.
+Note: `@fuzdev/tsv_wasm` is loaded only on `/docs/playground` via a browser-only dynamic `import()`, so the ~900KB-gzipped WASM (~2.9MB decoded) never weighs down `/docs` or the prerendered pages.
 
 Note: several devDependencies — `@webref/css` (CSS spec data), `zimmerframe` (AST traversal), `@sveltejs/acorn-typescript`, `zod`, and `@fuzdev/blake3_wasm` — are *optional peer dependencies* of `@fuzdev/fuz_css`'s `vite_plugin_fuz_css`, declared here so its build-time CSS generation resolves them (e.g. `css_literal.ts` imports `@webref/css`, `css_class_extractor.ts` walks ASTs with `zimmerframe`). They aren't imported by this app's own source, so don't mistake them for dead deps.
 
+Note: `vite` is deliberately held at 7.x (with `@sveltejs/vite-plugin-svelte` 6.x) — vite 8 + plugin-svelte 7 was buggy with this app or SvelteKit's integration. Don't upgrade to vite 8 without deliberately re-verifying the site works.
+
 ## Scope
 
 tsv.fuz.dev is the public face of the tsv tool:
@@ -45,26 +47,23 @@ tsv.fuz.dev is the public face of the tsv tool:
 - Docs section (introduction, playground, benchmarks)
 - Interactive playground (`/docs/playground`) — edit a deliberately-unformatted Svelte example in a syntax-highlighted editor (fuz_code's `CodeTextarea`); the formatted output and parsed AST update live alongside it; runs `@fuzdev/tsv_wasm` as lazily-loaded WASM
 - Theme controls via fuz_ui's `ThemeRoot` in the root layout (no separate about/settings page)
-- Shows install instructions for `@fuzdev/tsv_wasm` (full tool + `tsv` CLI; format/parse subsets mentioned in the intro)
+- Shows install instructions led by the native `@fuzdev/tsv` (prebuilt N-API addon for Node/Bun, ships the `tsv` CLI), then `@fuzdev/tsv_wasm` (universal, same `tsv` CLI) and the format/parse subsets
 
 ### What tsv.fuz.dev does NOT include (yet)
 
 - Authentication or backend
-- Native-binary downloads (tsv ships WASM-only at v0.1)
+- Standalone native-binary downloads (the native path ships as the `@fuzdev/tsv` npm addon, not as a downloadable executable)
 
 ## Routes
 
 ```
 src/
-├── lib/
-│   └── sample.ts             # placeholder constant (not yet wired up)
 ├── routes/
 │   ├── +page.svelte          # Home: hero, links to docs and benchmarks
 │   ├── +layout.svelte        # Root layout: fuz_css/fuz_code CSS, ThemeRoot, SiteState
 │   ├── +layout.ts            # prerender: true, ssr: true
 │   ├── style.css             # global styles
 │   ├── library.ts            # builds library_json from virtual:svelte-docinfo + pkg.json
-│   ├── example.test.ts       # placeholder test
 │   └── docs/
 │       ├── +layout.svelte    # Docs layout (Docs wrapper; sets library_context)
 │       ├── +page.svelte      # Docs index (DocsContent)
@@ -81,23 +80,70 @@ src/
 Benchmark data comes from `tsv`. Full workflow to update:
 
 ```bash
-# 1. In ~/dev/tsv — run benchmarks (builds ffi + wasm automatically)
+# 1. In ~/dev/tsv — run benchmarks across deno/node/bun (builds artifacts automatically)
 deno task bench
 
-# 2. In ~/dev/tsv.fuz.dev — copy the latest result
+# 2. In ~/dev/tsv.fuz.dev — copy the latest results
 npm run update-benchmarks
 ```
 
-Step 1 writes `benches/deno/results/report.json` (committed to tsv).
-Step 2 copies it to `src/routes/docs/benchmarks/benchmarks.json`.
-The JSON format matches `BenchmarkBaseline` in `benchmark_data.ts`.
+Step 1 writes the per-runtime `benches/js/results/report.<runtime>.{json,md}`
+siblings, the composed cross-runtime `report.{json,md}`, and the conformance
+coverage report `report.conformance.node.json` (committed to tsv).
+Step 2 copies three of them — `report.node.json` → `benchmarks.json`, the
+composed `report.json` → `benchmarks_cross_runtime.json`, and
+`report.conformance.node.json` → `benchmarks_conformance.json` — then runs
+`gro format` over the copies. Note the script's source paths are hardcoded to
+`../tsv` — if the reports were generated in a different worktree, copy them
+into `~/dev/tsv` (or copy manually) first.
+The JSON formats match the types in `benchmark_data.ts`.
+
+The end-to-end CLI comparison against Prettier, Biome, and Oxfmt comes from a
+separate harness, a fork of Oxc's `bench-formatter` that adds tsv
+(../oxc-bench-formatter). It publishes no JSON — its numbers live only as the
+hyperfine console dump in its README, between the
+`<!-- BENCHMARK_RESULTS_START -->` / `END` markers, plus a `## Versions` list
+and a `_Measured on: …_` machine line. To update:
+
+```bash
+# 1. In ~/dev/oxc-bench-formatter — re-run and rewrite its README (needs a built ../tsv)
+pnpm run update-readme
+
+# 2. In ~/dev/tsv.fuz.dev — reparse the README into JSON
+gro gen
+```
+
+`benchmarks_formatters.gen.json.ts` parses that README and writes
+`benchmarks_formatters.json`, keeping only the scenarios tsv participates in
+(it has no JSX/TSX parser, so the harness runs it on the JSX-free corpora
+only). That includes the harness's Svelte scenario, which benches tsv against
+rsvelte-fmt (`@rsvelte/fmt`); a scenario renders on the page only once it has
+an entry in `SCENARIO_COPY` (`benchmarks_cli.ts`), and prose claims about the
+Svelte head-to-head are conditional on its data being present, so the site
+stays correct whether or not the harness README has been regenerated with it.
+
+A **missing** sibling checkout is the one tolerated case — generation is
+skipped, the committed JSON stands, and `gro gen --check` passes on any machine
+or CI that has only this repo (CI never checks out the harness, so it always
+takes this path; no `--no-gen` needed). A README that **is** present but has
+drifted fails the task loudly, naming the scenario and the section that stopped
+parsing, rather than publishing stale or scenario-stripped numbers. A drift that
+still parses but renames a scenario is caught on the site side instead: every
+key in `benchmarks_cli.ts`'s `SCENARIO_COPY` must resolve to generated data, and
+a test asserts it.
 
 Key files in `src/routes/docs/benchmarks/`:
 
-- `benchmarks.json` — raw benchmark data (copied from tsv)
+- `benchmarks.json` — per-runtime Node report (copied from tsv)
+- `benchmarks_cross_runtime.json` — composed cross-runtime report (copied from tsv)
+- `benchmarks_conformance.json` — conformance parse-coverage report (copied from tsv)
+- `benchmarks_formatters.json` — formatter CLI comparison, generated from the sibling harness's README
 - `benchmark_data.ts` — TypeScript types matching the JSON format
-- `benchmarks.ts` — re-exports the JSON with types
+- `formatter_benchmark_data.ts` — types plus `parse_formatter_benchmarks`, the README parser
+- `benchmarks_cli.ts` — shapes `benchmarks_formatters.json` for `BenchmarksCli.svelte` and owns the per-scenario prose; the numbers are all generated
+- `benchmarks.ts`, `benchmarks_cross_runtime.ts`, `benchmarks_conformance.ts`, `benchmarks_formatters.ts` — re-export the JSON with types
 - `BenchmarksBar.svelte`, `BenchmarksGroup.svelte`, etc. — visualization components
+- `BenchmarksBaselineGroup.svelte` — shared interactive column behind the format, parse, and binary-size groups: hovering a row re-baselines that group's ratios (each of the three groups per section is independent), restoring the default anchor (the canonical reference — Prettier for format, the JS baseline for parse — and the smallest build for size) on mouseleave. `benchmark_data.ts`'s `compute_baseline_ratio`/`format_baseline_ratio`/`baseline_ratio_color` carry the per-`BaselineDirection` (`speed`/`size`) formulas it and the derivations share
 
 ## Architecture
 
@@ -105,6 +151,7 @@ Key files in `src/routes/docs/benchmarks/`:
 - Uses fuz_ui tome system for docs navigation
 - `docs/tomes.ts` defines the doc sections: introduction, playground, benchmarks
 - Benchmark data lives in `src/routes/docs/benchmarks/benchmarks.json` (see [Benchmarks](#benchmarks))
+- The benchmarks page quotes no hand-written ratios — its prose computes them from the same reports the charts render, via `benchmark_data.ts`'s `benchmark_speedup`/`format_ratio_approx`/`format_ratio_range`/`format_ratio_range_approx` and `benchmarks_cli.ts`'s `cli_speedup_vs_tsv`/`cli_memory_ratio_range`. A test gates that every pair the copy names still resolves
 - `library.ts` builds component metadata at runtime from the `virtual:svelte-docinfo` module (provided by the `svelte-docinfo` Vite plugin); the docs index passes it to `DocsContent`
 - The playground (`/docs/playground`) loads `@fuzdev/tsv_wasm` via a browser-only dynamic `import()` inside `Playground.svelte`, so the WASM code-splits into its own chunk fetched only on that route — the same lazy discipline `library.ts` uses for the heavy svelte-docinfo data, keeping `/docs` and the prerendered pages WASM-free. `@fuzdev/tsv_wasm` is in `vite.config.ts` `optimizeDeps.exclude` (like `blake3_wasm`)
 - The playground's editor is fuz_code's `CodeTextarea` (live syntax highlighting via the experimental CSS Custom Highlight API). It needs `@fuzdev/fuz_code/theme_highlight.css`, imported inside `Playground.svelte` rather than the root layout so it stays on this route only; `supports_css_highlight_api()` drives a graceful-degradation note where the API is unavailable (the editor still works, unstyled)
@@ -117,7 +164,7 @@ Deploys to `https://tsv.fuz.dev/` via `gro deploy` (builds and pushes to deploy
 
 - TypeScript strict mode
 - Svelte 5 with runes API
-- Prettier with tabs, 100 char width
+- tsv with tabs, 100 char width
 - Node >= 24.14
 - Private package (not published to npm)
 
diff --git a/eslint.config.js b/eslint.config.js
index 100b57f..d903ae8 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -1,3 +1,3 @@
-import {configs} from '@ryanatkn/eslint-config';
+import { configs } from '@ryanatkn/eslint-config';
 
 export default configs;
diff --git a/package-lock.json b/package-lock.json
index ee9152a..a898e19 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,35 +10,32 @@
       "license": "MIT",
       "devDependencies": {
         "@fuzdev/blake3_wasm": "^0.1.1",
-        "@fuzdev/fuz_code": "^0.46.3",
+        "@fuzdev/fuz_code": "^0.48.0",
         "@fuzdev/fuz_css": "^0.63.2",
-        "@fuzdev/fuz_ui": "^0.206.5",
+        "@fuzdev/fuz_ui": "^0.206.7",
         "@fuzdev/fuz_util": "^0.65.2",
-        "@fuzdev/gro": "^0.205.1",
-        "@fuzdev/mdz": "^0.2.0",
-        "@fuzdev/tsv_wasm": "^0.1.0",
-        "@ryanatkn/eslint-config": "^0.12.1",
+        "@fuzdev/gro": "^0.209.0",
+        "@fuzdev/mdz": "^0.3.0",
+        "@fuzdev/tsv_wasm": "^0.2.0",
+        "@ryanatkn/eslint-config": "^0.12.2",
         "@sveltejs/acorn-typescript": "^1.0.9",
         "@sveltejs/adapter-static": "^3.0.10",
-        "@sveltejs/kit": "^2.61.1",
-        "@sveltejs/vite-plugin-svelte": "^7.1.2",
+        "@sveltejs/kit": "^2.69.1",
+        "@sveltejs/vite-plugin-svelte": "^6.2.4",
         "@types/estree": "^1.0.8",
         "@types/node": "^24.12.4",
         "@webref/css": "^8.2.0",
         "eslint": "^9.39.1",
         "eslint-plugin-svelte": "^3.13.1",
         "esm-env": "^1.2.2",
-        "magic-string": "^0.30.21",
-        "prettier": "^3.7.4",
-        "prettier-plugin-svelte": "^3.4.1",
-        "svelte": "^5.56.0",
-        "svelte-check": "^4.3.6",
+        "svelte": "^5.56.4",
+        "svelte-check": "^4.7.2",
         "svelte-docinfo": "^0.5.4",
         "svelte2tsx": "^0.7.47",
         "tslib": "^2.8.1",
         "typescript": "^5.9.3",
         "typescript-eslint": "^8.48.1",
-        "vite": "^8.0.16",
+        "vite": "^7.3.6",
         "vitest": "^4.1.9",
         "zimmerframe": "^1.1.4",
         "zod": "^4.3.6"
@@ -54,6 +51,7 @@
       "dev": true,
       "license": "MIT",
       "optional": true,
+      "peer": true,
       "dependencies": {
         "@emnapi/wasi-threads": "1.2.1",
         "tslib": "^2.4.0"
@@ -66,6 +64,7 @@
       "dev": true,
       "license": "MIT",
       "optional": true,
+      "peer": true,
       "dependencies": {
         "tslib": "^2.4.0"
       }
@@ -77,6 +76,7 @@
       "dev": true,
       "license": "MIT",
       "optional": true,
+      "peer": true,
       "dependencies": {
         "tslib": "^2.4.0"
       }
@@ -94,7 +94,6 @@
       "os": [
         "aix"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -112,7 +111,6 @@
       "os": [
         "android"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -130,7 +128,6 @@
       "os": [
         "android"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -148,7 +145,6 @@
       "os": [
         "android"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -166,7 +162,6 @@
       "os": [
         "darwin"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -184,7 +179,6 @@
       "os": [
         "darwin"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -202,7 +196,6 @@
       "os": [
         "freebsd"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -220,7 +213,6 @@
       "os": [
         "freebsd"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -238,7 +230,6 @@
       "os": [
         "linux"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -256,7 +247,6 @@
       "os": [
         "linux"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -274,7 +264,6 @@
       "os": [
         "linux"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -292,7 +281,6 @@
       "os": [
         "linux"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -310,7 +298,6 @@
       "os": [
         "linux"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -328,7 +315,6 @@
       "os": [
         "linux"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -346,7 +332,6 @@
       "os": [
         "linux"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -364,7 +349,6 @@
       "os": [
         "linux"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -382,7 +366,6 @@
       "os": [
         "linux"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -400,7 +383,6 @@
       "os": [
         "netbsd"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -418,7 +400,6 @@
       "os": [
         "netbsd"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -436,7 +417,6 @@
       "os": [
         "openbsd"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -454,7 +434,6 @@
       "os": [
         "openbsd"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -472,7 +451,6 @@
       "os": [
         "openharmony"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -490,7 +468,6 @@
       "os": [
         "sunos"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -508,7 +485,6 @@
       "os": [
         "win32"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -526,7 +502,6 @@
       "os": [
         "win32"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -544,7 +519,6 @@
       "os": [
         "win32"
       ],
-      "peer": true,
       "engines": {
         "node": ">=18"
       }
@@ -720,9 +694,9 @@
       }
     },
     "node_modules/@fuzdev/fuz_code": {
-      "version": "0.46.3",
-      "resolved": "https://registry.npmjs.org/@fuzdev/fuz_code/-/fuz_code-0.46.3.tgz",
-      "integrity": "sha512-vN+h5Z9t0dBBEMTlngWQas/wJqK5L6xsroItj17iGuDvmm8V4kKrFbUEFltnSSwLrICypXyywrCTwqVb/QkFqA==",
+      "version": "0.48.0",
+      "resolved": "https://registry.npmjs.org/@fuzdev/fuz_code/-/fuz_code-0.48.0.tgz",
+      "integrity": "sha512-uzcAkElwu73UULfd2Vij0U9oCL0ySZEYHd8CxYGSglxLZc4JzTIxDpFkY67glPBmAVR36CgyXpdWGGCTW3bF7A==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -801,9 +775,9 @@
       }
     },
     "node_modules/@fuzdev/fuz_ui": {
-      "version": "0.206.5",
-      "resolved": "https://registry.npmjs.org/@fuzdev/fuz_ui/-/fuz_ui-0.206.5.tgz",
-      "integrity": "sha512-P+9U7xuGs1O1NrusiItcCQF/Sx7HPs/Tukg6cyWqDOatdRtro/nIVlzASZvk7/34fzGrwXYiHobRmY1jBchxHA==",
+      "version": "0.206.7",
+      "resolved": "https://registry.npmjs.org/@fuzdev/fuz_ui/-/fuz_ui-0.206.7.tgz",
+      "integrity": "sha512-UUO+6zVK6Ot9NmZLaKWASJ6odjjLOUDObIWOjSKtoPBnSu62UvzlGYdSGEHYk1hSR58wNj0qndhWNDzmf/WDdg==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -884,18 +858,17 @@
       }
     },
     "node_modules/@fuzdev/gro": {
-      "version": "0.205.1",
-      "resolved": "https://registry.npmjs.org/@fuzdev/gro/-/gro-0.205.1.tgz",
-      "integrity": "sha512-o5WBXWSH/UlN1BsDnpBNIi0WHR7lj7UFGltH/JctSP7oSB2ojvmoXD5OLCEeVdRVcDaSQKl48xcXKUwHKqVSmQ==",
+      "version": "0.209.0",
+      "resolved": "https://registry.npmjs.org/@fuzdev/gro/-/gro-0.209.0.tgz",
+      "integrity": "sha512-i2eViCE4aRoJgcaVEf2Xiq6iqHmrKmYpoyHGDDoFVSs4WeKs34ZacqBbMe8vkmaeUQauFIVUnFcFbudArngAtw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
+        "@fuzdev/tsv_wasm": "^0.2.0",
         "chokidar": "^5.0.0",
         "dotenv": "^17.2.3",
         "esm-env": "^1.2.2",
         "oxc-parser": "^0.99.0",
-        "prettier": "^3.7.4",
-        "prettier-plugin-svelte": "^3.5.1",
         "ts-blank-space": "^0.6.2",
         "tslib": "^2.8.1"
       },
@@ -935,9 +908,9 @@
       }
     },
     "node_modules/@fuzdev/mdz": {
-      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/@fuzdev/mdz/-/mdz-0.2.0.tgz",
-      "integrity": "sha512-ZdAcPtGAETgMg4kGx9xZ+K6FJ76CMoQ0MoxC0+r/2iCgXvo70VkQSxOswmfojzX335WT+Oe0PzsiXy1DWDth9Q==",
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/@fuzdev/mdz/-/mdz-0.3.0.tgz",
+      "integrity": "sha512-hd6hEWYY/CUqAHc277pYKySkjHbwABy6vY+AOd0GArOcsi6QM6FZ3nTiB3Lzw7NECx0ODPjPuHCFPYkFOhKm8w==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -967,9 +940,9 @@
       }
     },
     "node_modules/@fuzdev/tsv_wasm": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/@fuzdev/tsv_wasm/-/tsv_wasm-0.1.0.tgz",
-      "integrity": "sha512-hlZxdL1c5jiMyLnMv3NWONxNR64JChNekxlsKEJxXvgr/bmcRsgF1XuyabOTtppW9C+9HUvCpklJgJeU4aZbKw==",
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/@fuzdev/tsv_wasm/-/tsv_wasm-0.2.0.tgz",
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       "resolved": "https://registry.npmjs.org/lilconfig/-/lilconfig-2.1.0.tgz",
@@ -3879,33 +3704,6 @@
         "node": ">= 0.8.0"
       }
     },
-    "node_modules/prettier": {
-      "version": "3.7.4",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.7.4.tgz",
-      "integrity": "sha512-v6UNi1+3hSlVvv8fSaoUbggEM5VErKmmpGA7Pl3HF8V6uKY7rvClBOJlH6yNwQtfTueNkGVpOv/mtWL9L4bgRA==",
-      "dev": true,
-      "license": "MIT",
-      "bin": {
-        "prettier": "bin/prettier.cjs"
-      },
-      "engines": {
-        "node": ">=14"
-      },
-      "funding": {
-        "url": "https://github.com/prettier/prettier?sponsor=1"
-      }
-    },
-    "node_modules/prettier-plugin-svelte": {
-      "version": "3.5.1",
-      "resolved": "https://registry.npmjs.org/prettier-plugin-svelte/-/prettier-plugin-svelte-3.5.1.tgz",
-      "integrity": "sha512-65+fr5+cgIKWKiqM1Doum4uX6bY8iFCdztvvp2RcF+AJoieaw9kJOFMNcJo/bkmKYsxFaM9OsVZK/gWauG/5mg==",
-      "dev": true,
-      "license": "MIT",
-      "peerDependencies": {
-        "prettier": "^3.0.0",
-        "svelte": "^3.2.0 || ^4.0.0-next.0 || ^5.0.0-next.0"
-      }
-    },
     "node_modules/punycode": {
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
@@ -3940,48 +3738,49 @@
         "node": ">=4"
       }
     },
-    "node_modules/rolldown": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/rolldown/-/rolldown-1.0.3.tgz",
-      "integrity": "sha512-i00lAJ2ks1BYr7rjNjKC7BcqAS7nVfiT3QX1SI5aY+AFHblCmaUf9OE9dbdzDvW6dJxbi2ZCZiy9v3CcwOiX3g==",
+    "node_modules/rollup": {
+      "version": "4.62.2",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.62.2.tgz",
+      "integrity": "sha512-RFnrW4lhXA3s3eqHDZvN654g8OTjzRfqpIRJYczCGB6HzphckVAi/Qh4tbPUbRuDi7s1Llv8g/NspLkttY3gTA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@oxc-project/types": "=0.133.0",
-        "@rolldown/pluginutils": "^1.0.0"
+        "@types/estree": "1.0.9"
       },
       "bin": {
-        "rolldown": "bin/cli.mjs"
+        "rollup": "dist/bin/rollup"
       },
       "engines": {
-        "node": "^20.19.0 || >=22.12.0"
+        "node": ">=18.0.0",
+        "npm": ">=8.0.0"
       },
       "optionalDependencies": {
-        "@rolldown/binding-android-arm64": "1.0.3",
-        "@rolldown/binding-darwin-arm64": "1.0.3",
-        "@rolldown/binding-darwin-x64": "1.0.3",
-        "@rolldown/binding-freebsd-x64": "1.0.3",
-        "@rolldown/binding-linux-arm-gnueabihf": "1.0.3",
-        "@rolldown/binding-linux-arm64-gnu": "1.0.3",
-        "@rolldown/binding-linux-arm64-musl": "1.0.3",
-        "@rolldown/binding-linux-ppc64-gnu": "1.0.3",
-        "@rolldown/binding-linux-s390x-gnu": "1.0.3",
-        "@rolldown/binding-linux-x64-gnu": "1.0.3",
-        "@rolldown/binding-linux-x64-musl": "1.0.3",
-        "@rolldown/binding-openharmony-arm64": "1.0.3",
-        "@rolldown/binding-wasm32-wasi": "1.0.3",
-        "@rolldown/binding-win32-arm64-msvc": "1.0.3",
-        "@rolldown/binding-win32-x64-msvc": "1.0.3"
-      }
-    },
-    "node_modules/rolldown/node_modules/@oxc-project/types": {
-      "version": "0.133.0",
-      "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.133.0.tgz",
-      "integrity": "sha512-KzkdCd6Uxqnf6l3HOw1xfatAlUURA0g14cvBYFyJ5SaNOQbOUvBr9PKArcPcrNIeRsBdgcUzOGrhKveVpvOIGA==",
-      "dev": true,
-      "license": "MIT",
-      "funding": {
-        "url": "https://github.com/sponsors/Boshen"
+        "@rollup/rollup-android-arm-eabi": "4.62.2",
+        "@rollup/rollup-android-arm64": "4.62.2",
+        "@rollup/rollup-darwin-arm64": "4.62.2",
+        "@rollup/rollup-darwin-x64": "4.62.2",
+        "@rollup/rollup-freebsd-arm64": "4.62.2",
+        "@rollup/rollup-freebsd-x64": "4.62.2",
+        "@rollup/rollup-linux-arm-gnueabihf": "4.62.2",
+        "@rollup/rollup-linux-arm-musleabihf": "4.62.2",
+        "@rollup/rollup-linux-arm64-gnu": "4.62.2",
+        "@rollup/rollup-linux-arm64-musl": "4.62.2",
+        "@rollup/rollup-linux-loong64-gnu": "4.62.2",
+        "@rollup/rollup-linux-loong64-musl": "4.62.2",
+        "@rollup/rollup-linux-ppc64-gnu": "4.62.2",
+        "@rollup/rollup-linux-ppc64-musl": "4.62.2",
+        "@rollup/rollup-linux-riscv64-gnu": "4.62.2",
+        "@rollup/rollup-linux-riscv64-musl": "4.62.2",
+        "@rollup/rollup-linux-s390x-gnu": "4.62.2",
+        "@rollup/rollup-linux-x64-gnu": "4.62.2",
+        "@rollup/rollup-linux-x64-musl": "4.62.2",
+        "@rollup/rollup-openbsd-x64": "4.62.2",
+        "@rollup/rollup-openharmony-arm64": "4.62.2",
+        "@rollup/rollup-win32-arm64-msvc": "4.62.2",
+        "@rollup/rollup-win32-ia32-msvc": "4.62.2",
+        "@rollup/rollup-win32-x64-gnu": "4.62.2",
+        "@rollup/rollup-win32-x64-msvc": "4.62.2",
+        "fsevents": "~2.3.2"
       }
     },
     "node_modules/sade": {
@@ -4120,9 +3919,9 @@
       }
     },
     "node_modules/svelte": {
-      "version": "5.56.0",
-      "resolved": "https://registry.npmjs.org/svelte/-/svelte-5.56.0.tgz",
-      "integrity": "sha512-kTXr26t1bchFp28ROrb957LtbujpBmBDibmqMGziVpUs7awBi96TGgX6SovrA8BNoEUDVRK2Fb9FkeYlGspoVg==",
+      "version": "5.56.4",
+      "resolved": "https://registry.npmjs.org/svelte/-/svelte-5.56.4.tgz",
+      "integrity": "sha512-/d0QHehmRuJW8gVz395MTkPcPozxzdjBMBE8oEYGz8O3b9KTMzzQ9ZHJQLuFKOHOPQbU6kx/X4iid/EBBzH7iw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -4137,7 +3936,7 @@
         "clsx": "^2.1.1",
         "devalue": "^5.8.1",
         "esm-env": "^1.2.1",
-        "esrap": "^2.2.9",
+        "esrap": "^2.2.12",
         "is-reference": "^3.0.3",
         "locate-character": "^3.0.0",
         "magic-string": "^0.30.11",
@@ -4148,13 +3947,14 @@
       }
     },
     "node_modules/svelte-check": {
-      "version": "4.3.6",
-      "resolved": "https://registry.npmjs.org/svelte-check/-/svelte-check-4.3.6.tgz",
-      "integrity": "sha512-uBkz96ElE3G4pt9E1Tw0xvBfIUQkeH794kDQZdAUk795UVMr+NJZpuFSS62vcmO/DuSalK83LyOwhgWq8YGU1Q==",
+      "version": "4.7.2",
+      "resolved": "https://registry.npmjs.org/svelte-check/-/svelte-check-4.7.2.tgz",
+      "integrity": "sha512-GoS4XJdGswlq0rIT1vtFLzJY1bvHtY37McY9H9Gkm1Ggw/ICdZYn8J/Z8Yi0BEL0i3R4+jtaWVePjyppMlij/A==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "@jridgewell/trace-mapping": "^0.3.25",
+        "@sveltejs/load-config": "^0.2.0",
         "chokidar": "^4.0.1",
         "fdir": "^6.2.0",
         "picocolors": "^1.0.0",
@@ -4432,17 +4232,18 @@
       "license": "MIT"
     },
     "node_modules/vite": {
-      "version": "8.0.16",
-      "resolved": "https://registry.npmjs.org/vite/-/vite-8.0.16.tgz",
-      "integrity": "sha512-h9bXPmJichP5fLmVQo3PyaGSDE2n3aPuomeAlVRm0JLmt4rY6zmPKd59HYI4LNW8oTK7tlTsuC7l/m7awx9Jcw==",
+      "version": "7.3.6",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-7.3.6.tgz",
+      "integrity": "sha512-4XP60spRGjSZFf1qYH+dJIkK2znL3zQfl9KkOV9MkkRR/3Dls0dxaBsQPTloEc5BLXWPL9vsOxopxyKoMmDueg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "lightningcss": "^1.32.0",
-        "picomatch": "^4.0.4",
-        "postcss": "^8.5.15",
-        "rolldown": "1.0.3",
-        "tinyglobby": "^0.2.17"
+        "esbuild": "^0.27.0 || ^0.28.0",
+        "fdir": "^6.5.0",
+        "picomatch": "^4.0.3",
+        "postcss": "^8.5.6",
+        "rollup": "^4.43.0",
+        "tinyglobby": "^0.2.15"
       },
       "bin": {
         "vite": "bin/vite.js"
@@ -4458,10 +4259,9 @@
       },
       "peerDependencies": {
         "@types/node": "^20.19.0 || >=22.12.0",
-        "@vitejs/devtools": "^0.1.18",
-        "esbuild": "^0.27.0 || ^0.28.0",
         "jiti": ">=1.21.0",
         "less": "^4.0.0",
+        "lightningcss": "^1.21.0",
         "sass": "^1.70.0",
         "sass-embedded": "^1.70.0",
         "stylus": ">=0.54.8",
@@ -4474,18 +4274,15 @@
         "@types/node": {
           "optional": true
         },
-        "@vitejs/devtools": {
-          "optional": true
-        },
-        "esbuild": {
-          "optional": true
-        },
         "jiti": {
           "optional": true
         },
         "less": {
           "optional": true
         },
+        "lightningcss": {
+          "optional": true
+        },
         "sass": {
           "optional": true
         },
diff --git a/package.json b/package.json
index e1c6a86..802c7b4 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "test": "gro test",
     "preview": "vite preview",
     "deploy": "gro deploy",
-    "update-benchmarks": "cp ../tsv/benches/deno/results/report.json src/routes/docs/benchmarks/benchmarks.json"
+    "update-benchmarks": "cp ../tsv/benches/js/results/report.node.json src/routes/docs/benchmarks/benchmarks.json && cp ../tsv/benches/js/results/report.json src/routes/docs/benchmarks/benchmarks_cross_runtime.json && cp ../tsv/benches/js/results/report.conformance.node.json src/routes/docs/benchmarks/benchmarks_conformance.json && gro format"
   },
   "type": "module",
   "engines": {
@@ -24,56 +24,36 @@
   },
   "devDependencies": {
     "@fuzdev/blake3_wasm": "^0.1.1",
-    "@fuzdev/fuz_code": "^0.46.3",
+    "@fuzdev/fuz_code": "^0.48.0",
     "@fuzdev/fuz_css": "^0.63.2",
-    "@fuzdev/fuz_ui": "^0.206.5",
+    "@fuzdev/fuz_ui": "^0.206.7",
     "@fuzdev/fuz_util": "^0.65.2",
-    "@fuzdev/gro": "^0.205.1",
-    "@fuzdev/mdz": "^0.2.0",
-    "@fuzdev/tsv_wasm": "^0.1.0",
-    "@ryanatkn/eslint-config": "^0.12.1",
+    "@fuzdev/gro": "^0.209.0",
+    "@fuzdev/mdz": "^0.3.0",
+    "@fuzdev/tsv_wasm": "^0.2.0",
+    "@ryanatkn/eslint-config": "^0.12.2",
     "@sveltejs/acorn-typescript": "^1.0.9",
     "@sveltejs/adapter-static": "^3.0.10",
-    "@sveltejs/kit": "^2.61.1",
-    "@sveltejs/vite-plugin-svelte": "^7.1.2",
+    "@sveltejs/kit": "^2.69.1",
+    "@sveltejs/vite-plugin-svelte": "^6.2.4",
     "@types/estree": "^1.0.8",
     "@types/node": "^24.12.4",
     "@webref/css": "^8.2.0",
     "eslint": "^9.39.1",
     "eslint-plugin-svelte": "^3.13.1",
     "esm-env": "^1.2.2",
-    "magic-string": "^0.30.21",
-    "prettier": "^3.7.4",
-    "prettier-plugin-svelte": "^3.4.1",
-    "svelte": "^5.56.0",
-    "svelte-check": "^4.3.6",
+    "svelte": "^5.56.4",
+    "svelte-check": "^4.7.2",
     "svelte-docinfo": "^0.5.4",
     "svelte2tsx": "^0.7.47",
     "tslib": "^2.8.1",
     "typescript": "^5.9.3",
     "typescript-eslint": "^8.48.1",
-    "vite": "^8.0.16",
+    "vite": "^7.3.6",
     "vitest": "^4.1.9",
     "zimmerframe": "^1.1.4",
     "zod": "^4.3.6"
   },
-  "prettier": {
-    "plugins": [
-      "prettier-plugin-svelte"
-    ],
-    "useTabs": true,
-    "printWidth": 100,
-    "singleQuote": true,
-    "bracketSpacing": false,
-    "overrides": [
-      {
-        "files": "package.json",
-        "options": {
-          "useTabs": false
-        }
-      }
-    ]
-  },
   "sideEffects": [
     "**/*.css"
   ],
diff --git a/src/app.d.ts b/src/app.d.ts
index 8364d73..7a47499 100644
--- a/src/app.d.ts
+++ b/src/app.d.ts
@@ -1,12 +1,12 @@
 // Registers ambient types for the `virtual:svelte-docinfo` module (Vite plugin).
 // eslint-disable-next-line @typescript-eslint/triple-slash-reference
 /// <reference types="svelte-docinfo/virtual-svelte-docinfo.js" />
-declare module 'virtual:fuz.css' {
-	const css: string;
-	export default css;
+declare module "virtual:fuz.css" {
+  const css: string;
+  export default css;
 }
-declare module 'virtual:pkg.json' {
-	import type {PkgJson} from '@fuzdev/fuz_util/pkg_json.ts';
-	const pkg_json: PkgJson;
-	export default pkg_json;
+declare module "virtual:pkg.json" {
+  import type { PkgJson } from "@fuzdev/fuz_util/pkg_json.ts";
+  const pkg_json: PkgJson;
+  export default pkg_json;
 }
diff --git a/src/app.html b/src/app.html
index e3061bc..a1c58fd 100644
--- a/src/app.html
+++ b/src/app.html
@@ -1,23 +1,29 @@
 <!doctype html>
 <html lang="en">
-	<head>
-		<meta charset="utf-8" />
-		<link rel="icon" href="%sveltekit.assets%/favicon.png" />
-		<link rel="icon" href="%sveltekit.assets%/logo.svg" sizes="any" type="image/svg+xml" />
-		<meta name="viewport" content="width=device-width, initial-scale=1" />
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%sveltekit.assets%/favicon.png" />
+    <link
+      rel="icon"
+      href="%sveltekit.assets%/logo.svg"
+      sizes="any"
+      type="image/svg+xml"
+    />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
 
-		<script>
-			document.documentElement.classList.add(
-				((c) =>
-					c === 'dark' || (c !== 'light' && matchMedia('(prefers-color-scheme:dark)').matches)
-						? 'dark'
-						: 'light')(localStorage.getItem('fuz:color-scheme')),
-			);
-		</script>
+    <script>
+      document.documentElement.classList.add(
+        ((c) =>
+          c === "dark" ||
+          (c !== "light" && matchMedia("(prefers-color-scheme:dark)").matches)
+            ? "dark"
+            : "light")(localStorage.getItem("fuz:color-scheme")),
+      );
+    </script>
 
-		%sveltekit.head%
-	</head>
-	<body data-sveltekit-preload-data="hover">
-		<div style="display: contents">%sveltekit.body%</div>
-	</body>
+    %sveltekit.head%
+  </head>
+  <body data-sveltekit-preload-data="hover">
+    <div style="display: contents">%sveltekit.body%</div>
+  </body>
 </html>
diff --git a/src/lib/sample.ts b/src/lib/sample.ts
deleted file mode 100644
index 429c922..0000000
--- a/src/lib/sample.ts
+++ /dev/null
@@ -1 +0,0 @@
-export const sample = 'TODO - publish tsv!';
diff --git a/src/routes/+layout.svelte b/src/routes/+layout.svelte
index 1e580bb..6411db4 100644
--- a/src/routes/+layout.svelte
+++ b/src/routes/+layout.svelte
@@ -4,13 +4,13 @@
 	import './style.css';
 
 	import ThemeRoot from '@fuzdev/fuz_ui/ThemeRoot.svelte';
-	import {SiteState, site_context} from '@fuzdev/fuz_ui/site.svelte.ts';
-	import {logo_tsv} from '@fuzdev/fuz_ui/logos.ts';
-	import type {Snippet} from 'svelte';
+	import { SiteState, site_context } from '@fuzdev/fuz_ui/site.svelte.ts';
+	import { logo_tsv } from '@fuzdev/fuz_ui/logos.ts';
+	import type { Snippet } from 'svelte';
 	import pkg_json from 'virtual:pkg.json';
 
 	const {
-		children,
+		children
 	}: {
 		children: Snippet;
 	} = $props();
@@ -19,7 +19,7 @@
 	// and `repo_url` points to the tsv tool repo rather than this website's repo
 	// (`pkg_json.repository`).
 	site_context.set(
-		new SiteState({icon: logo_tsv, pkg_json, repo_url: 'https://github.com/fuzdev/tsv'}),
+		new SiteState({ icon: logo_tsv, pkg_json, repo_url: 'https://github.com/fuzdev/tsv' })
 	);
 </script>
 
diff --git a/src/routes/+page.svelte b/src/routes/+page.svelte
index e98aa2e..c29ee24 100644
--- a/src/routes/+page.svelte
+++ b/src/routes/+page.svelte
@@ -1,10 +1,10 @@
 <script lang="ts">
-	import {resolve} from '$app/paths';
+	import { resolve } from '$app/paths';
 	import DocsFooter from '@fuzdev/fuz_ui/DocsFooter.svelte';
-	import {FUZ_DEV_URL} from '@fuzdev/fuz_ui/constants.ts';
-	import {site_context} from '@fuzdev/fuz_ui/site.svelte.ts';
+	import { FUZ_DEV_URL } from '@fuzdev/fuz_ui/constants.ts';
+	import { site_context } from '@fuzdev/fuz_ui/site.svelte.ts';
 	import Svg from '@fuzdev/fuz_ui/Svg.svelte';
-	import {logo_tsv} from '@fuzdev/fuz_ui/logos.ts';
+	import { logo_tsv } from '@fuzdev/fuz_ui/logos.ts';
 
 	const site = site_context.get();
 </script>
@@ -24,9 +24,9 @@
 	<section class="box">
 		<div class="column gap_lg">
 			<a class="font_size_xl chip px_xl py_sm text-align:center" href={resolve('/docs')}>docs</a>
-			<a class="font_size_xl chip px_xl py_sm text-align:center" href={resolve('/docs/benchmarks')}
-				>benchmarks</a
-			>
+			<a class="font_size_xl chip px_xl py_sm text-align:center" href={resolve('/docs/benchmarks')}>
+				benchmarks
+			</a>
 		</div>
 	</section>
 	<section class="box">
diff --git a/src/routes/docs/+layout.svelte b/src/routes/docs/+layout.svelte
index a161ea3..28a2d09 100644
--- a/src/routes/docs/+layout.svelte
+++ b/src/routes/docs/+layout.svelte
@@ -1,13 +1,13 @@
 <script lang="ts">
-	import type {Snippet} from 'svelte';
+	import type { Snippet } from 'svelte';
 	import Docs from '@fuzdev/fuz_ui/Docs.svelte';
-	import {Library, library_context} from '@fuzdev/fuz_ui/library.svelte.ts';
+	import { Library, library_context } from '@fuzdev/fuz_ui/library.svelte.ts';
 
-	import {tomes} from './tomes.ts';
-	import {library_json} from '$routes/library.ts';
+	import { tomes } from './tomes.ts';
+	import { library_json } from '$routes/library.ts';
 
 	const {
-		children,
+		children
 	}: {
 		children: Snippet;
 	} = $props();
diff --git a/src/routes/docs/+page.svelte b/src/routes/docs/+page.svelte
index 16a118e..735443a 100644
--- a/src/routes/docs/+page.svelte
+++ b/src/routes/docs/+page.svelte
@@ -1,7 +1,7 @@
 <script lang="ts">
 	import DocsContent from '@fuzdev/fuz_ui/DocsContent.svelte';
-	import {tomes_context} from '@fuzdev/fuz_ui/tome.ts';
-	import {library_context} from '@fuzdev/fuz_ui/library.svelte.ts';
+	import { tomes_context } from '@fuzdev/fuz_ui/tome.ts';
+	import { library_context } from '@fuzdev/fuz_ui/library.svelte.ts';
 
 	const get_tomes_by_slug = tomes_context.get();
 	const tomes = $derived(Array.from(get_tomes_by_slug().values()));
diff --git a/src/routes/docs/benchmarks/+page.svelte b/src/routes/docs/benchmarks/+page.svelte
index ef80d88..ab41a32 100644
--- a/src/routes/docs/benchmarks/+page.svelte
+++ b/src/routes/docs/benchmarks/+page.svelte
@@ -2,137 +2,270 @@
 	import TomeContent from '@fuzdev/fuz_ui/TomeContent.svelte';
 	import TomeSection from '@fuzdev/fuz_ui/TomeSection.svelte';
 	import TomeSectionHeader from '@fuzdev/fuz_ui/TomeSectionHeader.svelte';
-	import {tome_get_by_slug} from '@fuzdev/fuz_ui/tome.ts';
+	import { docs_slugify } from '@fuzdev/fuz_ui/docs_helpers.svelte.ts';
+	import { tome_get_by_slug } from '@fuzdev/fuz_ui/tome.ts';
 
-	import {benchmarks_json} from './benchmarks.ts';
+	import { benchmarks_json } from './benchmarks.ts';
+	import { benchmarks_conformance_json } from './benchmarks_conformance.ts';
+	import { benchmarks_cross_runtime_json } from './benchmarks_cross_runtime.ts';
 	import {
-		category_color,
+		benchmarks_cli,
+		cli_memory_ratio_range,
+		cli_speedup_vs_tsv,
+		CLI_TS_REPO_KEY,
+		CLI_SVELTE_KEY
+	} from './benchmarks_cli.ts';
+	import {
+		benchmark_speedup,
 		derive_benchmark_groups,
+		derive_conformance_groups,
 		derive_speedup_summary,
+		format_corpus_source_files,
+		format_ratio_approx,
+		format_ratio_range,
+		format_ratio_range_approx,
+		corpus_source_url
 	} from './benchmark_data.ts';
 	import BenchmarksSummary from './BenchmarksSummary.svelte';
 	import BenchmarksGroup from './BenchmarksGroup.svelte';
+	import BenchmarksConformance from './BenchmarksConformance.svelte';
 	import BenchmarksSizes from './BenchmarksSizes.svelte';
 	import BenchmarksMeta from './BenchmarksMeta.svelte';
+	import BenchmarksCrossRuntime from './BenchmarksCrossRuntime.svelte';
+	import BenchmarksCli from './BenchmarksCli.svelte';
 
 	const LIBRARY_ITEM_NAME = 'benchmarks';
 
 	const tome = tome_get_by_slug(LIBRARY_ITEM_NAME);
 
+	// Section titles referenced by in-page anchors, slugified the same way
+	// `TomeSectionHeader` builds its ids so a rename can't orphan a link.
+	const CLI_SECTION_TITLE = 'End-to-end CLI benchmark';
+	const CROSS_RUNTIME_SECTION_TITLE = 'Cross-runtime';
+
+	// The benchmarked runtime version and the report's date, read from the report
+	// itself so the prose tracks each data refresh (the shape tests pin the
+	// flagship report to node, so the "Node" label can't silently drift).
+	const node_display = `Node${
+		benchmarks_json.machine ? ` v${benchmarks_json.machine.runtime_version.split('.')[0]}` : ''
+	}`;
+	const report_month = new Date(benchmarks_json.timestamp).toLocaleDateString('en-US', {
+		month: 'long',
+		year: 'numeric'
+	});
+
 	const groups = derive_benchmark_groups(benchmarks_json);
 	const speedup_rows = derive_speedup_summary(groups);
+	const conformance_groups = derive_conformance_groups(benchmarks_conformance_json);
 
 	const corpus = $derived(benchmarks_json.corpus);
+	// Derived from the report so the "What's measured" figure can't drift from the
+	// copied data (the report carries per-language file counts, not bytes).
+	const corpus_file_count = $derived(Object.values(corpus).reduce((sum, n) => sum + n, 0));
 	const format_groups = groups.filter((g) => g.operation === 'format');
 	const parse_groups = groups.filter((g) => g.operation === 'parse');
+
+	// Every ratio the TLDR and the section notes quote, computed from the same
+	// reports the charts render so the prose can't drift from them. Native-vs-native
+	// pairs tsv with oxfmt, wasm-vs-wasm pairs tsv_wasm with biome-wasm; the parse
+	// comparison uses tsv's span-only wire, the shape oxc-parser also emits.
+	const speedup = (group: string, slower: string, faster: string) =>
+		format_ratio_approx(benchmark_speedup(benchmarks_json, group, slower, faster));
+	const format_ts_vs_oxfmt = speedup('format/typescript', 'oxfmt', 'tsv');
+	const format_ts_vs_prettier = speedup('format/typescript', 'prettier', 'tsv');
+	const format_ts_vs_biome = speedup('format/typescript', 'biome-wasm', 'tsv_wasm');
+	const format_svelte_vs_prettier = speedup('format/svelte', 'prettier', 'tsv');
+	const format_svelte_vs_biome = speedup('format/svelte', 'biome-wasm', 'tsv_wasm');
+	const format_css_vs_oxfmt = speedup('format/css', 'oxfmt', 'tsv');
+	const format_css_vs_biome = speedup('format/css', 'biome-wasm', 'tsv_wasm');
+	const parse_ts_vs_oxc = speedup('parse/typescript', 'oxc-parser', 'tsv-json-no-locations');
+	// The one entry that leads tsv's span-only wire, so the tldr quotes it in the
+	// direction the data actually runs rather than only naming what tsv beats.
+	const parse_ts_yuku_vs_tsv = speedup('parse/typescript', 'tsv-json-no-locations', 'yuku-parser');
+
+	// The end-to-end CLI claims, from the formatter-comparison report.
+	const cli_ts_wall_vs_oxfmt = format_ratio_approx(
+		cli_speedup_vs_tsv(CLI_TS_REPO_KEY, 'oxfmt', 'wall_ms')
+	);
+	const cli_ts_cpu_vs_oxfmt = format_ratio_approx(
+		cli_speedup_vs_tsv(CLI_TS_REPO_KEY, 'oxfmt', 'cpu_ms')
+	);
+	const cli_ts_wall_vs_biome = format_ratio_approx(
+		cli_speedup_vs_tsv(CLI_TS_REPO_KEY, 'biome', 'wall_ms')
+	);
+	// scoped to the two tools the TLDR sentence names, so the range it quotes
+	// is measured over exactly them (the full-span figure lives in the CLI section)
+	const cli_ts_memory = cli_memory_ratio_range(CLI_TS_REPO_KEY, ['oxfmt', 'biome']);
+	const cli_memory = cli_memory_ratio_range();
+	// The Svelte head-to-head is absent until the harness README is regenerated
+	// with it, so every claim about it is conditional on the data being present.
+	const cli_svelte_wall = cli_speedup_vs_tsv(CLI_SVELTE_KEY, 'rsvelte-fmt', 'wall_ms');
+	const cli_svelte_memory = cli_speedup_vs_tsv(CLI_SVELTE_KEY, 'rsvelte-fmt', 'memory_mb');
 </script>
 
 <TomeContent {tome}>
 	<section>
 		<p>
-			tsv is a toolchain for TypeScript/JS, CSS, and Svelte in Rust. Performance is its priority
-			after correctness, and the numbers compare favorably to Oxc and Biome for its supported
-			languages.
+			tsv is a toolchain for TypeScript/JS, CSS, and Svelte in Rust. After correctness, performance
+			is tsv's next priority. This page shows how it measures up against Prettier, which tsv closely
+			follows, and against <a href="https://oxc.rs/">Oxc</a> and
+			<a href="https://biomejs.dev/">Biome</a>, which are similar tools with wider language support
+			(tsv doesn't support JSX/TSX/SCSS/etc). Also included for comparison:
+			<a href="https://baseballyama.github.io/rsvelte/">rsvelte</a> (Svelte parser/formatter),
+			<a href="https://yuku.fyi/">Yuku</a> (TypeScript/JS parser),
+			<a href="https://swc.rs/">swc</a> (TypeScript/JS parser),
+			<a href="https://dprint.dev/">dprint-typescript</a> (TypeScript/JS formatter),
+			<a href="https://github.com/g-plane/malva">malva</a> (CSS formatter, dprint's CSS plugin), and
+			<a href="https://postcss.org/">PostCSS</a>
+			(CSS parser).
 		</p>
 	</section>
 
-	<section>
-		<div class="legend">
-			<span><i class="swatch" style:background={category_color('tsv_native')}></i> tsv native</span>
-			<span
-				><i class="swatch" style:background={category_color('tsv_native_json')}></i> tsv native json</span
-			>
-			<span><i class="swatch" style:background={category_color('tsv_wasm')}></i> tsv wasm</span>
-			<span
-				><i class="swatch" style:background={category_color('tsv_wasm_json')}></i> tsv wasm json</span
-			>
-			<span><i class="swatch" style:background={category_color('biome')}></i> biome</span>
-			<span><i class="swatch" style:background={category_color('oxc')}></i> oxc</span>
-			<span><i class="swatch" style:background={category_color('canonical')}></i> canonical</span>
-		</div>
-	</section>
-
 	<TomeSection>
-		<TomeSectionHeader text="Binary size" />
+		<TomeSectionHeader text="tldr" />
 		<p>
-			Rather than supporting many languages, tsv focuses on Svelte/HTML, TypeScript/JS, and CSS.
-			This lets it be smaller when it's all you need, a quality that's more relevant when used in
-			the browser via wasm:
+			Compared to Oxc and Biome, tsv is faster, smaller, and uses less memory to parse and format
+			its supported languages. This section has a prose summary; skip ahead for charts.
 		</p>
-		<BenchmarksSizes sizes={benchmarks_json.binary_sizes} />
-		<aside class="mt_xl5">
-			<p>Important notes:</p>
-			<ul>
-				<li>apples-to-apples comparisons are difficult here because of differing scope</li>
-				<li>Biome includes a parser, formatter, and linter supporting many languages</li>
-				<li>
-					tsv and tsv_wasm include a parser and formatter for Svelte/HTML, TypeScript/JS, and CSS
-				</li>
-				<li>
-					oxc-parser only parses TypeScript and JS, not CSS or HTML; oxfmt is its separate formatter
-				</li>
-				<li>oxfmt has no wasm build as of June 2026</li>
+		<p>
+			The measurements on this page are single-threaded and in-process, where each tool parses or
+			formats one file at a time (isolating engine speed from multi-core parallelism), measured over
+			a large collection of real-world repos: {corpus_file_count.toLocaleString('en-US')} files
+			including Svelte's official repos (svelte, kit, svelte.dev) and the
+			<a href="https://github.com/fuzdev">fuz.dev repos</a>. On that basis:
+		</p>
+		<ul>
+			<li>
+				Formatting TypeScript, tsv is ~{format_ts_vs_oxfmt} faster than Oxfmt (native-vs-native),
+				~{format_ts_vs_prettier} faster than Prettier (native Rust vs Prettier's JS), and
+				~{format_ts_vs_biome} faster than Biome (wasm-vs-wasm).
+			</li>
+			<li>
+				Formatting Svelte, tsv is ~{format_svelte_vs_prettier} faster than Prettier (which Oxfmt's
+				Svelte path delegates to internally) and ~{format_svelte_vs_biome} faster than Biome.
+			</li>
+			<li>
+				Formatting CSS, it's ~{format_css_vs_oxfmt} faster than Oxfmt and ~{format_css_vs_biome}
+				faster than Biome.
+			</li>
+			<li>
+				Parsing TypeScript to JSON, tsv is ~{parse_ts_vs_oxc} faster than Oxc, and
+				~{parse_ts_yuku_vs_tsv} slower than yuku-parser, which hands its AST to JS as a compact
+				binary buffer where tsv and Oxc both go through JSON; Biome doesn't expose its parser to JS.
+				tsv's default AST adds a per-node line/column <code>loc</code> for drop-in Svelte
+				compatibility, with a fast path to reconstruct locs in JS.
+			</li>
+			<li>
+				A
+				<a href="https://github.com/ryanatkn/oxc-bench-formatter" rel="external">
+					fork of Oxc's official <code>bench-formatter</code>
+				</a>
+				is an end-to-end CLI benchmark with its own corpus. On a real TypeScript repo, tsv formats
+				~{cli_ts_wall_vs_oxfmt} faster than Oxfmt and ~{cli_ts_wall_vs_biome} faster than Biome
+				using ~{cli_ts_memory
+					? format_ratio_range_approx(cli_ts_memory.min, cli_ts_memory.max)
+					: '—'}
+				less memory than either. Wall-clock ratios bake in each tool's multi-file parallelism — see
+				the notes in <a href="#{docs_slugify(CLI_SECTION_TITLE)}">that section</a>.
+			</li>
+			{#if cli_svelte_wall != null && cli_svelte_memory != null}
 				<li>
-					tsv doesn't publish native artifacts yet, but it builds them for benchmarking over FFI
-					with Deno
+					The fork's Svelte scenario benches tsv against rsvelte-fmt, the other Rust Svelte-native
+					formatter, on a third-party <code>.svelte</code> corpus: tsv formats
+					~{format_ratio_approx(cli_svelte_wall)} faster using ~{format_ratio_approx(
+						cli_svelte_memory
+					)} less memory.
 				</li>
-			</ul>
-		</aside>
+			{/if}
+		</ul>
+		<p>
+			Each section below has notes that attempt to fairly contextualize its numbers. The charts show
+			numbers using {node_display}, and at the end of the page is a
+			<a href="#{docs_slugify(CROSS_RUNTIME_SECTION_TITLE)}">cross-runtime comparison</a>.
+		</p>
 	</TomeSection>
 
 	<TomeSection>
-		<TomeSectionHeader text="Speedier than Prettier" />
-		<BenchmarksSummary rows={speedup_rows} {groups} {corpus} />
+		<TomeSectionHeader text="Like Prettier but speedier" />
+		<BenchmarksSummary rows={speedup_rows} />
 	</TomeSection>
 
 	<TomeSection>
-		<TomeSectionHeader text="Format" />
+		<TomeSectionHeader text="Format speed" />
 		<p class="mb_xl5">
-			tsv's formatter is similar to <a href="https://oxc.rs/docs/guide/usage/formatter.html"
-				>Oxfmt</a
-			>
-			and <a href="https://biomejs.dev/">Biome</a>. Today it can format Svelte, TypeScript, and CSS,
-			plus HTML and JS (as strict-mode TypeScript):
+			tsv's formatter is similar to
+			<a href="https://oxc.rs/docs/guide/usage/formatter.html">Oxfmt</a>,
+			<a href="https://biomejs.dev/formatter/">Biome</a>, and
+			<a href="https://dprint.dev/plugins/typescript/">dprint</a>. It formats Svelte, TypeScript,
+			and CSS, plus JS as strict-mode TypeScript:
 		</p>
 		{#each format_groups as group (group.language)}
 			<BenchmarksGroup {group} {corpus} />
 		{/each}
 		<aside class="mt_xl5">
-			<p>How to read these numbers:</p>
+			<p>Notes:</p>
 			<ul>
+				<li>wasm-to-wasm and native-to-native (N-API here) are the fair comparisons</li>
+				<li>
+					Oxfmt formats TypeScript, JS, and CSS with its own native engine, and for Svelte it
+					delegates to Prettier internally (via prettier-plugin-svelte).
+				</li>
 				<li>
-					Each tool is timed producing its own formatting, so outputs may differ. Prettier is the
-					reference, and Oxfmt also targets Prettier conformance. tsv tracks Prettier closely but
-					intentionally diverges in some documented cases, and Biome formats to its own style.
+					There's no native Biome entry: its native engine ships only as the <code>biome</code> CLI
+					binary, a separate process rather than an embeddable library, so it can't be fairly timed
+					in-process like the others.
 				</li>
 				<li>
-					Oxfmt only formats TypeScript and JS with its own native engine. For CSS and Svelte it
-					bundles and runs Prettier internally (plus prettier-plugin-svelte for Svelte), so its CSS
-					and Svelte rows essentially re-measure Prettier minus a little wrapper overhead.
+					The dprint entry is
+					<a href="https://dprint.dev/plugins/typescript/">dprint-plugin-typescript</a>, the engine
+					<code>deno fmt</code> runs for TypeScript and JS, loaded in-process as its wasm plugin. It
+					formats TypeScript and JS only — the plugin rejects CSS and Svelte — so it's grayed out in
+					those two groups. This times the engine, not the <code>deno fmt</code> CLI: a subprocess
+					per file would measure process startup instead of formatting.
 				</li>
 				<li>
-					The Prettier baseline runs in JS while the headline tsv row is the native build, so it's a
-					cross-tier comparison. For an engine-vs-engine read, compare within a runtime tier: wasm
-					vs wasm, or native vs native.
+					dprint's CSS work lives in a separate plugin,
+					<a href="https://github.com/g-plane/malva">malva</a>, which gets its own CSS entry over
+					the same wasm host. Its HTML plugin isn't included — it doesn't format Svelte.
 				</li>
 				<li>
-					tsv's CSS coverage is intentionally lower than Prettier's and Biome's - it rejects
-					non-standard non-Svelte CSS (SCSS, LESS, CSS Modules, IE hacks) to stay slim and focused.
-					Full CSS-spec compliance is on the roadmap, including error recovery.
+					<a href="https://github.com/baseballyama/rsvelte" rel="external">rsvelte-fmt</a>, the
+					other Rust-native Svelte formatter, is grayed out for a different reason than dprint: it
+					ran over every file, but isn't timed. It ships no in-process API, so each file costs a
+					fresh process, incompatible with tsv's single-threaded benchmarks. Its row reports
+					coverage only.{#if cli_svelte_wall != null}
+						For multi-threaded CLI speed, see the
+						<a href="#{docs_slugify(CLI_SECTION_TITLE)}">CLI section</a>.
+					{/if}
 				</li>
 			</ul>
 		</aside>
 	</TomeSection>
 
 	<TomeSection>
-		<TomeSectionHeader text="Parse" />
+		<TomeSectionHeader text="Parse speed" />
 		<p class="mb_xl5">
-			The parse rows that build a full JS AST are directly comparable: tsv and oxc-parser both
-			serialize the AST to JSON in Rust and deserialize it in JS, native and wasm alike. The
-			tsv-internal and tsv_wasm-internal rows are tsv's parse-only numbers - they build the native
+			The parse entries that build a full JS AST are comparable in mechanism: tsv and oxc-parser
+			both serialize the AST to JSON in Rust and deserialize it in JS, native and wasm alike. But
+			the deliverables differ — tsv's default wire (<code>tsv-json</code> /
+			<code>tsv_wasm-json</code>) carries a per-node <code>loc</code> (line/column) object that
+			oxc-parser's default span-only AST omits, and that <code>loc</code> is roughly half the wire
+			bytes and most of its JSON.parse cost. The <code>tsv-json-no-locations</code> /
+			<code>tsv_wasm-json-no-locations</code>
+			entries drop it, emitting the same span-only shape oxc does, so those are the payload-matched,
+			apples-to-apples comparison with oxc-parser (line/column stays derivable from the offsets plus
+			source, so nothing is lost). The tsv-internal and tsv_wasm-internal entries build the native
 			AST but skip JS-side materialization, so they show raw in-engine speed rather than a
 			cross-tool comparison.
 		</p>
+		<p class="mb_xl5">
+			yuku-parser, a JS/TS parser written in Zig, emits the same span-only AST as oxc, so it too
+			compares against the <code>no-locs</code> entries rather than tsv's <code>loc</code>-bearing
+			default. It reaches that AST differently: instead of serializing to JSON it returns a compact
+			binary buffer that its JS side decodes into objects. The deliverable is the same fully
+			materialized tree, so the entries stay comparable — though every one of them times parsing and
+			the hand-off into JS together, and this benchmark doesn't split the two.
+		</p>
 		{#each parse_groups as group (group.language)}
 			<BenchmarksGroup {group} {corpus} />
 		{/each}
@@ -143,7 +276,268 @@
 					JS parsers skip the Rust-to-JS serialization step that tsv and oxc pay for, which keeps
 					them competitive.
 				</li>
-				<li>Some parts of tsv are not well-optimized yet, particularly parsing CSS.</li>
+				<li>
+					Biome is shown grayed-out across all three parse groups because its
+					<code>@biomejs/js-api</code>
+					package doesn't expose a parser to JS (only formatting and linting). Biome parses
+					internally but never surfaces the AST across the JS boundary, so it can't be measured.
+				</li>
+				<li>
+					oxc-parser only parses TypeScript and JS (and JSX, not measured here). oxc-parser doesn't
+					expose a CSS parser, and it doesn't parse Svelte.
+				</li>
+				<li>
+					yuku-parser and swc both parse TypeScript and JS and nothing else — no CSS, no Svelte, no
+					formatter — so they appear in the TypeScript parse group only.
+				</li>
+				<li>
+					rsvelte's parser is the only other engine here that parses Svelte, and it's matched to
+					tsv's default wire on both counts that matter: it also hands JS a compact JSON string, and
+					on a real component the two payloads are within a couple of percent. So
+					<code>rsvelte-parse</code> compares against <code>tsv-json</code> directly, not against
+					the <code>no-locs</code> entries. Its second entry passes rsvelte's own
+					<code>skipExpressionLoc</code>, which drops <code>loc</code> only on embedded JS
+					expressions and keeps the top-level offsets — a different trade than tsv's span-only wire,
+					which is why that entry is named for the option rather than for tsv's.
+				</li>
+				<li>
+					swc parses into its own AST shape — a <code>Module</code> root carrying <code>span</code>
+					offsets rather than ESTree's <code>loc</code>/<code>range</code> — so it isn't
+					payload-matched to either tsv wire.
+				</li>
+				<li>
+					PostCSS is the only other CSS parser here, and the only kind available: no Rust CSS parser
+					exposes an AST to JS. Lightning CSS transforms rather than handing back a tree, Biome
+					doesn't surface a parser at all, and malva is a formatter. It's also the parser behind
+					Prettier's CSS printer, which makes it the parse-side counterpart to the Prettier entry in
+					the format group.
+				</li>
+				<li>
+					a CSS coverage gap is a grammar difference, not a verdict. The CSS reference row is
+					Svelte's <code>parseCss</code>, which tsv is a drop-in for — and unlike Svelte's parser on
+					the Svelte side, it isn't an authority on what valid CSS is in either direction. PostCSS
+					rejects a handful of files <code>parseCss</code> accepts (unclosed strings, a missing
+					semicolon) and accepts more that it rejects, mostly modern CSS Svelte's parser doesn't
+					implement yet — <code>@supports selector(…)</code>, mixins — rather than anything
+					malformed. So PostCSS landing a shade above tsv here is two grammars, not a gap.
+				</li>
+				<li>
+					the <code>no-locs</code> entries are the payload-matched comparison with oxc-parser (see
+					above); the plain <code>tsv-json</code> entries carry the larger <code>loc</code>-bearing
+					AST, so their slower number isn't an engine-speed difference.
+				</li>
+				<li>
+					<code>tsv internal (node napi)</code> and <code>tsv_wasm internal</code> aren't a fair
+					comparison to the other entries — they skip JS-side AST materialization entirely, so
+					they're included only to show tsv's own JSON-serialization overhead against its
+					non-internal entry.
+				</li>
+			</ul>
+		</aside>
+	</TomeSection>
+
+	<TomeSection>
+		<TomeSectionHeader text="Parse conformance" />
+		<p class="mb_xl5">
+			Separate from the speed numbers above that use a real-world corpus of code, this section
+			measures parse <em>coverage</em>: how much of a much larger, deliberately hard corpus each
+			parser accepts — Prettier's format-test suites, Svelte's compiler test suite, CSS extracted
+			from <a href="https://github.com/web-platform-tests/wpt">web-platform-tests</a>,
+			<a href="https://github.com/tc39/test262">test262</a>'s expected-valid strict-mode tests, and
+			the single-file cases from the
+			<a href="https://github.com/microsoft/TypeScript">TypeScript compiler</a>'s own test suite
+			that tsc itself parses cleanly.
+		</p>
+		{#if benchmarks_cross_runtime_json.conformance_vintage?.stale}
+			<aside class="mixed-vintage">
+				⚠ The conformance report backing this section comes from a different commit than the
+				speed reports above, so the two sections describe different builds until it is re-run.
+			</aside>
+		{/if}
+		<BenchmarksConformance groups={conformance_groups} />
+		<aside class="mt_xl5">
+			<p>Reading these numbers:</p>
+			<ul>
+				<li>
+					Coverage is per engine, not per binding — a parser accepts the same files whether it runs
+					native or wasm, so each tool appears once.
+				</li>
+				<li>
+					The yuku-parser row is its wasm binding: the native one segfaults on test262's
+					escaped-identifier tests, where a single identifier is a long run of braced unicode
+					escapes. Wasm runs the same parser with the fault contained, so the number stands — and on
+					the speed corpus above, which has no such identifiers, both bindings are measured.
+				</li>
+				<li>
+					For Svelte, the corpus excludes the files svelte/compiler itself rejects, so its number is
+					100% by construction and the rest read as drop-in fidelity against it — higher is strictly
+					better. For TypeScript and CSS the canonical parser isn't a clean validity oracle
+					(acorn-typescript trails modern syntax, Svelte's CSS parser is lenient), so those suites
+					keep intentionally-invalid and out-of-scope inputs — read them relative to each other, not
+					as an absolute target.
+				</li>
+				<li>
+					The <code>tsc</code> row is the TypeScript compiler's own parser, which appears here and
+					nowhere else on this page — a verdict rather than a speed. It selected the compiler slice of
+					this corpus (only the cases it parses cleanly are kept), so it scores 100% there by
+					construction, the way svelte/compiler does on the Svelte set; the rest of its number comes
+					from corpora it didn't select, where it rejects JSX and stage-1 proposals in Prettier's
+					JavaScript fixtures and a small tail of test262. That blend is why it doesn't read 100%.
+				</li>
+				<li>
+					Accepting a file says nothing about producing the <em>right</em> AST — tsv's output is
+					separately verified against the canonical parsers (svelte/compiler, acorn-typescript) at
+					corpus scale in its repo's conformance gates.
+				</li>
+			</ul>
+			{#if benchmarks_conformance_json.corpus_sources?.length}
+				<p>Corpus sources ({benchmarks_conformance_json.corpus_sources.length}):</p>
+				<ul>
+					{#each benchmarks_conformance_json.corpus_sources as source (source.path)}
+						{@const url = corpus_source_url(source)}
+						<li>
+							{#if url}
+								<!-- eslint-disable-next-line svelte/no-navigation-without-resolve -->
+								<a href={url} rel="external"><code>{source.path}</code></a>
+							{:else}
+								<code>{source.path}</code>
+							{/if}
+							— {format_corpus_source_files(source)}
+						</li>
+					{/each}
+				</ul>
+			{/if}
+		</aside>
+	</TomeSection>
+
+	<TomeSection>
+		<TomeSectionHeader text="Binary size" />
+		<p>
+			Rather than supporting many languages, tsv focuses on Svelte/HTML, TypeScript/JS, and CSS.
+			This lets it be smaller when it's all you need, a quality that's more relevant when used in
+			the browser via wasm.
+		</p>
+		<BenchmarksSizes sizes={benchmarks_json.binary_sizes} />
+		<aside class="mt_xl5">
+			<p>Important notes:</p>
+			<ul>
+				<li>apples-to-apples comparisons are difficult here because of differing scope</li>
+				<li>oxc-parser only parses TypeScript and JS/JSX; oxfmt is its separate formatter</li>
+				<li>
+					yuku-parser parses TypeScript and JS and ships no formatter, so both its builds sit under
+					Parser — but tsv's parse-only builds beside them carry parsers for Svelte and CSS too, so
+					the gap there is scope as much as engine
+				</li>
+				<li>tsv and tsv_wasm include a parser and formatter for Svelte, TypeScript/JS, and CSS</li>
+				<li>
+					Biome bundles a parser, formatter, and linter for many languages, but its native engine
+					ships only as the CLI binary, not an embeddable library, and <code>@biomejs/js-api</code>
+					exposes only formatting and linting. Every native entry here is an in-process library
+					call, so a subprocess CLI isn't a comparable artifact — only Biome's wasm build is
+					included
+				</li>
+				<li>
+					the <code>oxc-parser + oxfmt</code> entry under Full toolchain sums oxc's separate parser
+					and formatter packages, since together they're the closest equivalent to tsv's single
+					parse+format build
+				</li>
+				<li>
+					that combined figure is a little unfair to oxc: oxfmt statically links its own copy of the
+					same oxc parser (it has to parse to format) but doesn't depend on the
+					<code>oxc-parser</code>
+					package or expose parsing through its API. The two are independently compiled, so the sum
+					counts the parser's compiled code twice — more than a single build exposing both
+					operations (like tsv's) would need
+				</li>
+				<li>
+					oxfmt has no wasm build as of {report_month}, so it's shown grayed-out under Formatter,
+					holding its slot beside <code>oxfmt (napi)</code>
+				</li>
+				<li>
+					<code>rsvelte-fmt (binary)</code> is the widest scope mismatch here — a standalone
+					executable carrying a CLI and the whole oxc formatter beside its Svelte engine, where the
+					tsv entries are bare libraries
+				</li>
+				<li>
+					<code>rsvelte-fmt + oxfmt</code> is what you install to format a project, and the fairer
+					comparison to tsv's single build: over a directory it delegates non-Svelte files to
+					<code>oxfmt</code> and errors without it (hence the peer dependency). A single
+					<code>.svelte</code> file needs no oxfmt — it formats the embedded
+					<code>&lt;script&gt;</code> and <code>&lt;style&gt;</code> itself
+				</li>
+				<li>
+					<code>dprint (wasm)</code> and <code>malva (wasm)</code> are two plugins for the same
+					dprint formatter host — TypeScript/JS and CSS respectively — and neither exposes a parser,
+					so both sit under Formatter beside tsv's format-only wasm build. That build does Svelte,
+					TypeScript/JS and CSS in one artifact, so each gap there is scope before it's engine
+				</li>
+				<li>
+					<code>swc (napi)</code> and <code>rsvelte compiler (napi)</code> are the widest scope
+					mismatches in the table. Both back parse rows and ship no formatter, so they're grouped
+					under Parser, but each artifact is far larger than what's measured: swc's is an entire
+					compiler (transforms, minifier, bundler) where the benchmark calls only its parser, and
+					rsvelte's carries the Svelte compiler plus svelte2tsx, HMR diffing and a resolver. Read
+					them as what those addons ship, not as parser size
+				</li>
+				<li>
+					tsv's N-API addon for Node and Bun ships as <code>@fuzdev/tsv</code> (prebuilt
+					per-platform packages, which also carry the native <code>tsv</code> CLI binary that
+					<code>npx tsv</code>
+					runs); the C-FFI library Deno loads is built for benchmarking and not published
+				</li>
+			</ul>
+		</aside>
+	</TomeSection>
+
+	<TomeSection>
+		<TomeSectionHeader text={CLI_SECTION_TITLE} />
+		<p class="mb_xl5">
+			The numbers above measure tsv's engine in-process, one file at a time, using tsv's original
+			benchmarks. This section describes the results from a fork of Oxc's official
+			<a href="https://github.com/oxc-project/bench-formatter" rel="external">
+				<code>bench-formatter</code>
+			</a>
+			that <a href="https://github.com/ryanatkn/oxc-bench-formatter" rel="external">adds tsv</a>,
+			timing the whole CLI end-to-end — process spawn, file discovery, I/O, and each tool's default
+			multi-file parallelism — plus peak memory. It's the "what you experience typing the command"
+			measure, run on real repositories. tsv appears only in the JSX-free scenarios (it has no
+			JSX/TSX parser). The tsv binary measured here is the same one <code>@fuzdev/tsv</code> ships
+			in its platform packages and execs from <code>npx tsv</code> — the npx path just adds Node's
+			~20&nbsp;ms launcher on top.
+		</p>
+		<BenchmarksCli report={benchmarks_cli} />
+		<aside class="mt_xl5">
+			<p>How to read these numbers:</p>
+			<ul>
+				<li>
+					This measures the whole command, not the engine in isolation. tsv, oxfmt, and biome
+					parallelize across files while prettier is effectively serial, so the wall-clock ratios
+					bake in each tool's parallelism and scale with core count — they're only meaningful
+					alongside the machine they ran on. The <code>vs tsv (CPU work)</code> column is the
+					parallelism-neutral view (total CPU time across threads): on the TypeScript repo tsv is
+					~{cli_ts_wall_vs_oxfmt} faster than Oxfmt in wall-clock but only ~{cli_ts_cpu_vs_oxfmt} in
+					CPU work, the rest being cores Oxfmt uses and Prettier can't.
+				</li>
+				<li>
+					Peak memory doesn't depend on thread count, so it's the most directly comparable figure —
+					tsv uses {cli_memory ? format_ratio_range(cli_memory.min, cli_memory.max) : '—'} less than
+					every other tool in every scenario.
+				</li>
+				<li>
+					Formatting width isn't identical: prettier, biome, and oxfmt format at width 80 (oxfmt
+					explicitly, the others by default), while tsv is non-configurable at width 100. Different
+					widths mean different line-break work — a real if small asymmetry with no fix on tsv's
+					side.{#if cli_svelte_wall != null}
+						The Svelte scenario is the exception: rsvelte-fmt is configurable, so it runs at tsv's
+						style there and that head-to-head has no width asymmetry.
+					{/if}
+				</li>
+				<li>
+					Errors aren't penalized by the harness, but the tsv scenarios run a preflight parse check
+					first and every formatter accepts the whole corpus, so nothing is skipped. tsv is left out
+					of the fork's other three scenarios because they contain JSX/TSX or measure work tsv
+					doesn't do (embedded-language formatting, import and Tailwind-class sorting).
+				</li>
 			</ul>
 		</aside>
 	</TomeSection>
@@ -152,39 +546,51 @@
 		<TomeSectionHeader text="Benchmarking details" />
 		<p>
 			All numbers are single-threaded: every library formats or parses one file at a time, measured
-			sequentially with no cross-file parallelism. These are per-file, single-core latency and
-			throughput numbers - not the multi-core batch throughput a CLI gets when it formats many files
-			at once, which most of these tools (tsv included) can do.
+			sequentially with no cross-file parallelism. Each row is the total time to process the whole
+			corpus once on a single core — not the multi-core batch throughput a CLI gets when it formats
+			many files at once, which most of these tools (tsv included) can do.
 		</p>
 		<p class="mb_xl3">
-			What's measured: around 5,500 files (~15 MB) of
-			<code>.svelte</code>/<code>.html</code>, <code>.ts</code>/<code>.js</code>, and
-			<code>.css</code>, from three sources: the fuz.dev libraries and apps, upstream framework
-			source (Svelte, SvelteKit, and the svelte.dev site), and formatter conformance fixtures
-			(Prettier's and prettier-plugin-svelte's own test suites - deliberately tricky edge cases, not
-			typical code, so they skew the corpus toward hard cases).
+			What's measured: {corpus_file_count.toLocaleString('en-US')} files of <code>.svelte</code>,
+			<code>.ts</code>/<code>.js</code>, and <code>.css</code> — real-world code only, from two
+			sources: the author's libraries, apps, and sites (the fuz.dev ecosystem plus personal
+			SvelteKit sites), and upstream framework source (Svelte, SvelteKit, and the svelte.dev site).
+			The CSS set also includes real-authored CSS extracted from those components'
+			<code>&lt;style&gt;</code>
+			blocks, concatenated per repo — standalone CSS files are rare in this ecosystem, and the same
+			bytes appear in the Svelte rows (rows are never summed). Test files count as real code and
+			stay in; fixture files (the formatter test suites that used to be part of this corpus, and
+			fixture subtrees inside the measured repos) are excluded — deliberately tricky edge cases
+			measure conformance, not typical throughput, and are covered by the parse-conformance section
+			above.
 		</p>
 		<BenchmarksMeta baseline={benchmarks_json} />
 	</TomeSection>
+
+	<TomeSection>
+		<TomeSectionHeader text={CROSS_RUNTIME_SECTION_TITLE} />
+		<p>
+			The same benchmark harness runs under three JS runtimes — Node, Deno, and Bun. The headline
+			numbers above are the Node run. The native entry differs by runtime: Node and Bun load tsv's
+			N-API addon, while Deno loads its C-FFI library. They share code but cross a different binding
+			boundary, so a per-runtime delta on the same row is a runtime effect — the JS engine or the
+			binding boundary — not a difference in tsv's own engine, which is identical across all three.
+		</p>
+		<aside class="mt_xl5 mb_xl5">
+			<p>
+				The <code>tsv-internal</code> rows cross the native binding boundary but materialize nothing
+				on the JS side, so a delta there is the binding boundary itself; the JSON-materializing
+				parse rows add each JS engine's <code>JSON.parse</code> cost on top. Node is the headline as
+				the default N-API path, not a speed pick.
+			</p>
+		</aside>
+		<BenchmarksCrossRuntime report={benchmarks_cross_runtime_json} />
+	</TomeSection>
 </TomeContent>
 
 <style>
-	.legend {
-		display: flex;
-		gap: var(--space_xl);
-		flex-wrap: wrap;
-		font-size: var(--font_size_sm);
-		margin-bottom: var(--space_xl);
-	}
-	.legend span {
-		display: flex;
-		align-items: center;
-		gap: var(--space_xs);
-	}
-	.swatch {
-		display: inline-block;
-		width: 1.6rem;
-		height: 1.6rem;
-		border-radius: var(--border_radius_xs);
+	/* the warning red tint over fuz_css's base aside styling (same as BenchmarksCrossRuntime) */
+	.mixed-vintage {
+		border-left-color: var(--color_c_50);
 	}
 </style>
diff --git a/src/routes/docs/benchmarks/BenchmarksBar.svelte b/src/routes/docs/benchmarks/BenchmarksBar.svelte
index 128c7b5..beae5e7 100644
--- a/src/routes/docs/benchmarks/BenchmarksBar.svelte
+++ b/src/routes/docs/benchmarks/BenchmarksBar.svelte
@@ -3,7 +3,7 @@
 		category_color,
 		format_label,
 		type FormattedUnit,
-		type ImplementationCategory,
+		type ImplementationCategory
 	} from './benchmark_data.ts';
 
 	const {
@@ -14,6 +14,10 @@
 		ratio_text,
 		ratio_color,
 		annotation,
+		disabled = false,
+		coverage_only = false,
+		on_enter,
+		on_leave
 	}: {
 		label: string;
 		bar_fraction: number;
@@ -24,48 +28,102 @@
 		// optional extra context shown between value and ratio (corpus coverage in
 		// benchmark groups, gzipped size in binary-size groups); omitted when absent
 		annotation?: string | undefined;
+		// a grayed-out, inert placeholder (a tool that doesn't run in this group) —
+		// no bar, no value, no ratio, just the label held in its shared slot
+		disabled?: boolean;
+		// inert for a different reason: the tool DID run over the whole corpus but
+		// was deliberately never timed (no in-process API, so a per-file row would
+		// have measured process spawn). Reads `not timed` rather than `n/a`, since
+		// "we chose not to measure this" and "this tool wasn't here" are different
+		// claims and the gray alone can't tell them apart
+		coverage_only?: boolean;
+		// hover-to-rebaseline: fired when the pointer enters/leaves the row so the
+		// group can adopt this row as its ratio anchor; omitted on inert placeholders
+		on_enter?: (() => void) | undefined;
+		on_leave?: (() => void) | undefined;
 	} = $props();
+
+	// the parenthesized binding suffix (`(wasm)`/`(node napi)`) describes how the
+	// tool actually ran in this (Node) report - meaningless for the disabled
+	// placeholders of single-variant tools (biome and dprint each ship only a wasm
+	// build here, so there's no ambiguity to lose). oxc-parser keeps its suffix even
+	// when disabled since it has two placeholder rows (napi and wasm) that would
+	// otherwise become indistinguishable.
+	const display_label = $derived(
+		disabled && (category === 'biome' || category === 'dprint')
+			? format_label(label).replace(/ \([^)]*\)$/, '')
+			: format_label(label)
+	);
 </script>
 
-<div class="bar-row" class:has-annotation={annotation != null}>
-	<span class="bar-label">{format_label(label)}</span>
+<!-- the hover handlers only re-baseline the group's ratios — a non-essential
+	visual aid over data that's fully visible regardless, with the default anchor
+	serving keyboard and no-hover users — so the row stays presentational -->
+<!-- svelte-ignore a11y_no_static_element_interactions -->
+<div
+	class="bar-row"
+	class:has-annotation={annotation != null}
+	class:disabled
+	onmouseenter={on_enter}
+	onmouseleave={on_leave}
+>
+	<span class="bar-label">{display_label}</span>
 	<div class="bar-track">
-		<div
-			class="bar-fill"
-			style:width="{bar_fraction * 100}%"
-			style:background={category_color(category)}
-		></div>
+		{#if !disabled}
+			<div
+				class="bar-fill"
+				style:width="{bar_fraction * 100}%"
+				style:background={category_color(category)}
+			></div>
+		{/if}
 	</div>
-	<span class="bar-value">{value.value} <span class="text_50">{value.unit}</span></span>
+	<span class="bar-value">
+		{#if disabled}
+			<span class="text_40">{coverage_only ? 'not timed' : 'n/a'}</span>
+		{:else}
+			{value.value} <span class="text_50">{value.unit}</span>
+		{/if}
+	</span>
 	{#if annotation != null}
 		<span class="bar-annotation text_50">{annotation}</span>
 	{/if}
-	<span class="bar-ratio" style:color={ratio_color}>{ratio_text}</span>
+	<span class="bar-ratio" style:color={ratio_color}>
+		{#if !disabled}{ratio_text}{/if}
+	</span>
 </div>
 
 <style>
 	.bar-row {
 		display: grid;
-		grid-template-columns: 12rem 1fr 5.6rem 3.4rem;
+		grid-template-columns: 16rem 1fr 5.6rem 3.4rem;
 		align-items: center;
 		gap: var(--space_sm);
-		height: 2rem;
+		/* rows sit flush (no inter-row gap) with a little padding, so the hover
+		 * highlight reads as one contiguous, full-height band per row */
+		padding-block: var(--space_xs);
+		border-radius: var(--border_radius_xs);
 	}
 	.bar-row.has-annotation {
-		grid-template-columns: 12rem 1fr 5.6rem 6rem 3.4rem;
+		grid-template-columns: 16rem 1fr 5.6rem 6rem 3.4rem;
+	}
+	.bar-row.disabled {
+		opacity: 0.6;
+	}
+	/* hovering an enabled row makes it the group's ratio anchor (driven in JS); the
+	 * highlight marks which row every ratio in the group is now measured against */
+	.bar-row:not(.disabled):hover {
+		background-color: var(--fg_10);
 	}
 	.bar-annotation {
 		font-size: var(--font_size_xs);
 		text-align: right;
-		font-variant-numeric: tabular-nums;
 		white-space: nowrap;
 	}
 	.bar-label {
 		font-size: var(--font_size_sm);
 		text-align: right;
-		overflow: hidden;
-		text-overflow: ellipsis;
 		white-space: nowrap;
+		/* these may overflow slightly/harmlessly, just need to visually check */
 	}
 	.bar-track {
 		height: 1.2rem;
@@ -81,7 +139,6 @@
 	.bar-value {
 		font-size: var(--font_size_sm);
 		text-align: right;
-		font-variant-numeric: tabular-nums;
 		white-space: nowrap;
 	}
 	.bar-ratio {
diff --git a/src/routes/docs/benchmarks/BenchmarksBaselineGroup.svelte b/src/routes/docs/benchmarks/BenchmarksBaselineGroup.svelte
new file mode 100644
index 0000000..5ff6a67
--- /dev/null
+++ b/src/routes/docs/benchmarks/BenchmarksBaselineGroup.svelte
@@ -0,0 +1,51 @@
+<script lang="ts">
+	import {
+		baseline_ratio_color,
+		compute_baseline_ratio,
+		format_baseline_ratio,
+		type BaselineDirection,
+		type BaselineRow
+	} from './benchmark_data.ts';
+	import BenchmarksBar from './BenchmarksBar.svelte';
+
+	const {
+		rows,
+		direction
+	}: {
+		// ordered so the first enabled row is the default baseline (callers lead with
+		// the canonical reference for speed, the smallest build for size)
+		rows: Array<BaselineRow>;
+		direction: BaselineDirection;
+	} = $props();
+
+	// the row currently acting as the baseline: the hovered row while the pointer is
+	// over an enabled row, otherwise the group default (its first enabled row). Each
+	// group instance owns its own state, so the three groups in a section re-baseline
+	// independently.
+	let hovered_key: string | undefined = $state(undefined);
+	const default_anchor_key = $derived(rows.find((r) => !r.disabled)?.key);
+	const anchor_key = $derived(hovered_key ?? default_anchor_key);
+	const anchor_row = $derived(rows.find((r) => r.key === anchor_key));
+</script>
+
+<div class="column">
+	{#each rows as row (row.key)}
+		{@const ratio =
+			!row.disabled && anchor_row && row.key !== anchor_key
+				? compute_baseline_ratio(direction, row.raw, anchor_row.raw)
+				: undefined}
+		<BenchmarksBar
+			label={row.label}
+			bar_fraction={row.bar_fraction}
+			category={row.category}
+			value={row.value}
+			annotation={row.annotation}
+			disabled={row.disabled}
+			coverage_only={row.coverage_only}
+			ratio_text={ratio != null ? format_baseline_ratio(direction, ratio) : '1.0x'}
+			ratio_color={ratio != null ? baseline_ratio_color(direction, ratio) : 'var(--text_40)'}
+			on_enter={row.disabled ? undefined : () => (hovered_key = row.key)}
+			on_leave={() => (hovered_key = undefined)}
+		/>
+	{/each}
+</div>
diff --git a/src/routes/docs/benchmarks/BenchmarksCli.svelte b/src/routes/docs/benchmarks/BenchmarksCli.svelte
new file mode 100644
index 0000000..2ad10d6
--- /dev/null
+++ b/src/routes/docs/benchmarks/BenchmarksCli.svelte
@@ -0,0 +1,125 @@
+<script lang="ts">
+	import { format_speedup } from './benchmark_data.ts';
+	import type { BenchmarksCliReport, CliScenario, CliFormatterResult } from './benchmarks_cli.ts';
+
+	const {
+		report
+	}: {
+		report: BenchmarksCliReport;
+	} = $props();
+
+	// listed as the harness reported them, so a formatter added or dropped upstream
+	// shows up here instead of silently rendering `undefined` for a fixed key
+	const versions = $derived(
+		Object.entries(report.versions)
+			.map(([name, version]) => `${name} ${version}`)
+			.join(', ')
+	);
+
+	const format_time = (ms: number): string =>
+		ms < 1000 ? `${Math.round(ms)} ms` : `${(ms / 1000).toFixed(1)} s`;
+
+	// tsv is the reference row; every ratio is `other / tsv` (>1 = tsv is that many
+	// times faster / lighter). Returns null for the tsv row itself.
+	interface Row {
+		result: CliFormatterResult;
+		is_tsv: boolean;
+		wall_ratio: number | null;
+		cpu_ratio: number | null;
+		memory_ratio: number | null;
+	}
+	const to_rows = (scenario: CliScenario): Array<Row> => {
+		const tsv = scenario.results.find((r) => r.label === 'tsv');
+		if (!tsv) return [];
+		return scenario.results.map((result) => {
+			const is_tsv = result === tsv;
+			return {
+				result,
+				is_tsv,
+				wall_ratio: is_tsv ? null : result.wall_ms / tsv.wall_ms,
+				cpu_ratio: is_tsv ? null : result.cpu_ms / tsv.cpu_ms,
+				memory_ratio:
+					is_tsv || result.memory_mb == null || tsv.memory_mb == null
+						? null
+						: result.memory_mb / tsv.memory_mb
+			};
+		});
+	};
+</script>
+
+{#each report.scenarios as scenario (scenario.key)}
+	<div class="scenario">
+		<h3>{scenario.heading}: {scenario.target}</h3>
+		<p>{scenario.description}</p>
+		<div class="table-scroll">
+			<table>
+				<thead>
+					<tr>
+						<th class="formatter">formatter</th>
+						<th>time</th>
+						<th>vs tsv</th>
+						<th>vs tsv (CPU work)</th>
+						<th>peak RSS</th>
+						<th>vs tsv</th>
+					</tr>
+				</thead>
+				<tbody>
+					{#each to_rows(scenario) as row (row.result.label)}
+						<tr class:tsv={row.is_tsv}>
+							<td class="formatter">{row.result.label}</td>
+							<td>{format_time(row.result.wall_ms)}</td>
+							<td class="speedup">
+								{row.wall_ratio == null ? '—' : format_speedup(row.wall_ratio)}
+							</td>
+							<td class="speedup">{row.cpu_ratio == null ? '—' : format_speedup(row.cpu_ratio)}</td>
+							<td>
+								{row.result.memory_mb == null ? '—' : `${Math.round(row.result.memory_mb)} MB`}
+							</td>
+							<td class="speedup">
+								{row.memory_ratio == null ? '—' : format_speedup(row.memory_ratio)}
+							</td>
+						</tr>
+					{/each}
+				</tbody>
+			</table>
+		</div>
+	</div>
+{/each}
+
+<p class="versions">
+	Measured on {report.machine} — {versions}. Wall-clock ratios scale with core count; "vs tsv (CPU
+	work)" is the parallelism-neutral view.
+</p>
+
+<style>
+	.scenario {
+		margin-bottom: var(--space_xl2);
+	}
+	/* wide table scrolls in its own container so the page body never scrolls sideways */
+	.table-scroll {
+		overflow-x: auto;
+	}
+	table {
+		width: 100%;
+	}
+	th,
+	td {
+		padding: var(--space_xs) var(--space_sm);
+		text-align: right;
+		white-space: nowrap;
+	}
+	.formatter {
+		text-align: left;
+	}
+	.speedup {
+		font-weight: 600;
+	}
+	tr.tsv {
+		font-weight: 700;
+		background-color: var(--fg_10);
+	}
+	.versions {
+		font-size: var(--font_size_sm);
+		opacity: 0.7;
+	}
+</style>
diff --git a/src/routes/docs/benchmarks/BenchmarksConformance.svelte b/src/routes/docs/benchmarks/BenchmarksConformance.svelte
new file mode 100644
index 0000000..849fffe
--- /dev/null
+++ b/src/routes/docs/benchmarks/BenchmarksConformance.svelte
@@ -0,0 +1,102 @@
+<!--
+	TODO: show per-corpus-source coverage, not just the per-language aggregate.
+
+	Each group's aggregate blends corpora that answer different questions, so the
+	single percentage below is a summary rather than the finding. `parse/typescript`
+	is mostly test262 — ECMAScript, not TypeScript — so a real TS gap moves the
+	number by tenths of a point and reads as noise. And on the corpus a tool's own
+	parser selected, that tool scores 100% BY CONSTRUCTION rather than by
+	achievement (tsc on the tsc corpus, svelte/compiler on the Svelte set), which
+	the aggregate presents as if it were a result.
+
+	The data is already here: the report carries `coverage_by_source`
+	(`group → source → impl → {processed, total}`) from `version` 8 on — the
+	machine-readable half of the per-source tables in tsv's own markdown report,
+	which splits exactly this way and for exactly this reason. It needs a
+	`derive_*` in `benchmark_data.ts` plus a nested table or a per-source
+	breakdown under each group.
+-->
+<script lang="ts">
+	import { format_coverage_percent, type ConformanceGroup } from './benchmark_data.ts';
+
+	const {
+		groups
+	}: {
+		groups: Array<ConformanceGroup>;
+	} = $props();
+
+	const LANGUAGE_LABELS: Record<string, string> = {
+		svelte: 'Svelte',
+		typescript: 'TypeScript',
+		css: 'CSS'
+	};
+</script>
+
+{#each groups as group (group.language)}
+	<div class="mb_xl5">
+		<p class="heading">
+			Parsing {group.files_total.toLocaleString('en-US')}
+			{LANGUAGE_LABELS[group.language] ?? group.language} files
+		</p>
+		<table>
+			<thead>
+				<tr>
+					<th></th>
+					<th class="num">files accepted</th>
+					<th class="num">coverage</th>
+				</tr>
+			</thead>
+			<tbody>
+				{#each group.rows as row (row.name)}
+					<tr>
+						<td>
+							{row.name}{#if row.note}
+								<span class="note">({row.note})</span>
+							{/if}
+						</td>
+						<td class="num">
+							{row.files_processed.toLocaleString('en-US')} / {row.files_total.toLocaleString(
+								'en-US'
+							)}
+						</td>
+						<td class="num percent">{format_coverage_percent(row.coverage_fraction)}</td>
+					</tr>
+				{/each}
+			</tbody>
+		</table>
+	</div>
+{/each}
+
+<style>
+	.heading {
+		margin-bottom: var(--space_xs);
+	}
+	table {
+		width: 100%;
+		max-width: 40rem;
+		border-collapse: collapse;
+	}
+	th {
+		font-weight: 400;
+		font-size: var(--font_size_sm);
+		color: var(--text_40);
+		text-align: left;
+		padding-block: var(--space_xs);
+	}
+	td {
+		padding-block: var(--space_xs);
+		border-top: var(--border_width) solid var(--border_color);
+	}
+	.note {
+		font-size: var(--font_size_sm);
+		color: var(--text_40);
+	}
+	.num {
+		text-align: right;
+		white-space: nowrap;
+		font-variant-numeric: tabular-nums;
+	}
+	.percent {
+		font-weight: 700;
+	}
+</style>
diff --git a/src/routes/docs/benchmarks/BenchmarksCrossRuntime.svelte b/src/routes/docs/benchmarks/BenchmarksCrossRuntime.svelte
new file mode 100644
index 0000000..15ce361
--- /dev/null
+++ b/src/routes/docs/benchmarks/BenchmarksCrossRuntime.svelte
@@ -0,0 +1,203 @@
+<script lang="ts">
+	import {
+		category_color,
+		cross_runtime_ratio_background,
+		derive_cross_runtime_groups,
+		derive_runtime_versions,
+		derive_unavailable_by_runtime,
+		format_cross_runtime_label,
+		format_speedup,
+		is_impl_unavailable,
+		order_cross_runtime_runtimes,
+		type BenchmarkRuntime,
+		type CrossRuntimeReport
+	} from './benchmark_data.ts';
+
+	const {
+		report
+	}: {
+		report: CrossRuntimeReport;
+	} = $props();
+
+	// The node/deno/bun versions the columns were measured under (node-first).
+	const runtime_versions = $derived(derive_runtime_versions(report));
+
+	// Node-first (the flagship N-API runtime), then deno, then bun — the same
+	// display order `derive_cross_runtime_groups` anchors its ratios on.
+	const runtimes = $derived(order_cross_runtime_runtimes(report.runtimes));
+	const base = $derived(runtimes[0]);
+	// ratio columns compare every other runtime against the base (node)
+	const others = $derived(runtimes.filter((r) => r !== base));
+
+	const groups = $derived(derive_cross_runtime_groups(report));
+
+	// Which runtimes couldn't load which implementations — the difference between
+	// a missing number that means "this binding is broken here" and one that means
+	// "this runtime's report has no such row" (an older sibling, say).
+	const unavailable = $derived(derive_unavailable_by_runtime(report));
+
+	const format_ops = (n: number | undefined): string => (n == null ? 'fail' : n.toFixed(2));
+
+	// An absent number reads as a load failure only when the report says so; every
+	// other gap is a row that runtime never measured, which a mixed-vintage set
+	// makes ordinary. Both render as `fail`, so the title carries the difference.
+	const missing_cell_title = (name: string, runtime: BenchmarkRuntime): string =>
+		is_impl_unavailable(report, runtime, name)
+			? `${name} failed to load under ${runtime}, so it contributes no row there`
+			: `${runtime}'s report carries no ${name} row — not measured there`;
+
+	const group_label = (operation: string, language: string): string =>
+		`${operation === 'format' ? 'Format' : 'Parse'} ${language}`;
+
+	// the per-runtime timed counts in column order, for a row whose runtimes
+	// timed different file sets (see `CrossRuntimeDisplayRow.files_iterated_mismatch`)
+	const files_mismatch_label = (
+		mismatch: Partial<Record<BenchmarkRuntime, number | null>>
+	): string => runtimes.map((runtime) => mismatch[runtime] ?? '—').join('/');
+</script>
+
+<div class="cross-runtime">
+	{#if report.mixed_vintage}
+		<aside class="mixed-vintage">
+			⚠ The per-runtime reports backing these tables come from different commits/versions, so the
+			ratios are unreliable until every runtime is re-run.
+		</aside>
+	{/if}
+	{#if report.mixed_machine}
+		<aside class="mixed-vintage">
+			⚠ The per-runtime reports backing these tables were produced on different hardware, so the
+			ratios are not comparable until every runtime is re-run on one machine.
+		</aside>
+	{/if}
+	{#if unavailable.length}
+		<aside class="mixed-vintage">
+			⚠ Some implementations don't load on every runtime:
+			<ul class="unavailable">
+				{#each unavailable as { runtime, rows } (runtime)}
+					<li><code>{runtime}</code> — {rows.join(', ')}</li>
+				{/each}
+			</ul>
+			These rows are unmeasured there, so a gap in those columns is a load failure rather than a
+			speed result.
+		</aside>
+	{/if}
+	{#if runtime_versions.length}
+		<ul class="versions">
+			{#each runtime_versions as { runtime, version } (runtime)}
+				<li><code>{runtime}</code> {version}</li>
+			{/each}
+		</ul>
+	{/if}
+	{#each groups as group (group.group)}
+		<div class="group">
+			<h4 class="mt_0 mb_sm">{group_label(group.operation, group.language)}</h4>
+			<table>
+				<thead>
+					<tr>
+						<th></th>
+						{#each runtimes as runtime (runtime)}
+							<th class="num">{runtime}</th>
+						{/each}
+						{#each others as runtime (runtime)}
+							<th class="num">{runtime}/{base}</th>
+						{/each}
+					</tr>
+				</thead>
+				<tbody>
+					{#each group.rows as row (row.name)}
+						<tr>
+							<td>
+								<i class="swatch" style:background={category_color(row.category)}></i>
+								{format_cross_runtime_label(row.name)}
+								{#if row.files_iterated_mismatch}
+									<small
+										class="files-mismatch"
+										title="the runtimes timed different file sets ({runtimes.join(
+											'/'
+										)}) — each runtime times the files its own binding accepted, so part of this row's ratio is file-set composition, not runtime"
+									>
+										⚠ files {files_mismatch_label(row.files_iterated_mismatch)}
+									</small>
+								{/if}
+							</td>
+							{#each runtimes as runtime (runtime)}
+								{@const ops = row.ops_per_second[runtime]}
+								<td class="num" title={ops == null ? missing_cell_title(row.name, runtime) : undefined}>
+									{format_ops(ops)}
+								</td>
+							{/each}
+							{#each others as runtime (runtime)}
+								{@const ratio = row.ratio_vs_base[runtime]}
+								<td
+									class="num ratio"
+									style:background={ratio != null
+										? cross_runtime_ratio_background(ratio)
+										: undefined}
+								>
+									{ratio != null ? format_speedup(ratio) : 'fail'}
+								</td>
+							{/each}
+						</tr>
+					{/each}
+				</tbody>
+			</table>
+		</div>
+	{/each}
+	<p class="text_40">
+		sweeps/sec — one sweep is a full pass over the group's timed file set (higher is faster); ratios
+		are vs <code>{base}</code> (&gt; 1 = faster than {base}). A
+		<code>fail</code> is a row that runtime contributed no number for — an implementation it can't
+		load (listed above when the report records it), or one its report doesn't carry. The
+		<code>native</code> rows load each runtime's idiomatic binding of the same engine — the N-API
+		addon under <code>node</code> and <code>bun</code> (<code>tsv (node napi)</code>), the C-FFI
+		library under <code>deno</code> (<code>tsv (deno ffi)</code>) — so the <code>deno</code> column
+		is a first-class FFI-vs-N-API comparison, not a re-run of the same binding.
+	</p>
+</div>
+
+<style>
+	/* the warning red tint over fuz_css's base aside styling */
+	.mixed-vintage {
+		border-left-color: var(--color_c_50);
+	}
+	/* the per-runtime load failures inside the disclosure aside */
+	.unavailable {
+		margin-block: var(--space_xs);
+	}
+	/* the runtime versions the columns were measured under — a compact horizontal row */
+	.versions {
+		display: flex;
+		flex-wrap: wrap;
+		column-gap: var(--space_lg);
+		row-gap: var(--space_xs);
+		list-style: none;
+		padding: 0;
+		margin-bottom: var(--space_xl3);
+		font-size: var(--font_size_sm);
+		opacity: 0.7;
+	}
+	.group {
+		margin-bottom: var(--space_xl4);
+	}
+	table {
+		width: 100%;
+	}
+	.num {
+		text-align: right;
+	}
+	.ratio {
+		font-weight: 700;
+	}
+	td .swatch {
+		display: inline-block;
+		width: 1.2rem;
+		height: 1.2rem;
+		border-radius: var(--border_radius_xs);
+		vertical-align: middle;
+	}
+	/* same warning tint as the mixed-vintage asides */
+	.files-mismatch {
+		margin-left: var(--space_xs);
+		color: var(--color_c_50);
+	}
+</style>
diff --git a/src/routes/docs/benchmarks/BenchmarksGroup.svelte b/src/routes/docs/benchmarks/BenchmarksGroup.svelte
index d3e2cb8..c26fd26 100644
--- a/src/routes/docs/benchmarks/BenchmarksGroup.svelte
+++ b/src/routes/docs/benchmarks/BenchmarksGroup.svelte
@@ -1,30 +1,43 @@
 <script lang="ts">
-	import {
-		format_coverage,
-		format_ns,
-		format_speedup,
-		speedup_color,
-		type BenchmarkGroup,
-	} from './benchmark_data.ts';
-	import BenchmarksBar from './BenchmarksBar.svelte';
+	import { format_ns, type BaselineRow, type BenchmarkGroup } from './benchmark_data.ts';
+	import BenchmarksBaselineGroup from './BenchmarksBaselineGroup.svelte';
 
 	const {
 		group,
-		corpus,
+		corpus
 	}: {
 		group: BenchmarkGroup;
 		corpus: Record<string, number>;
 	} = $props();
 
-	// coverage annotations only appear on baselines that carry them (version 3+)
-	const has_coverage = $derived(group.entries.some((e) => e.files_total != null));
-
 	const total = $derived(corpus[group.language] ?? 0);
-	// the timed benchmark runs on the per-group intersection (`files_iterated`), a
-	// subset of the discovered corpus; show "<timed> of <total>" when we have it,
-	// falling back to the corpus total on older baselines (< version 4)
-	const count_label = $derived(
-		group.files_iterated != null ? `${group.files_iterated} of ${total}` : `${total}`,
+	// the count of files actually benchmarked (`files_iterated`), falling back to the
+	// corpus total on older baselines (< version 4)
+	const count_label = $derived((group.files_iterated ?? total).toLocaleString('en-US'));
+
+	// a coverage-only row's accept rate is its entire measurement, so it renders as
+	// the row's annotation; siblings get an empty one so the grid's column template
+	// stays uniform across the group (same trick as BenchmarksSizes' gzip fallback)
+	const has_coverage_only = $derived(group.entries.some((e) => e.coverage_only));
+
+	const rows: Array<BaselineRow> = $derived(
+		group.entries.map((e) => ({
+			key: e.name,
+			label: e.name,
+			category: e.category,
+			bar_fraction: e.bar_fraction,
+			// the whole-sweep mean — total time to process the group's iterated corpus
+			// once, which is also what the ratios derive from via `raw`
+			value: format_ns(e.mean_ns),
+			raw: e.mean_ns,
+			annotation: has_coverage_only
+				? e.coverage_only && e.files_processed != null && e.files_total != null
+					? `${e.files_processed.toLocaleString('en-US')}/${e.files_total.toLocaleString('en-US')} files`
+					: ''
+				: undefined,
+			disabled: e.disabled ?? false,
+			coverage_only: e.coverage_only ?? false
+		}))
 	);
 </script>
 
@@ -33,27 +46,9 @@
 		<span>
 			{group.operation === 'format' ? 'Formatting' : 'Parsing'}
 			{count_label}
-			{group.language} files</span
-		>
-		{#if has_coverage}<span class="text_40" style:text-align="right"
-				>files handled / total &nbsp;&middot;&nbsp; speed</span
-			>{/if}
+			{group.language} files
+		</span>
+		<span class="text_40" style:text-align="right">total time &nbsp;&middot;&nbsp; speed</span>
 	</p>
-	<div class="column gap_xs">
-		{#each group.entries as entry (entry.name)}
-			<BenchmarksBar
-				label={entry.name}
-				bar_fraction={entry.bar_fraction}
-				category={entry.category}
-				value={format_ns(entry.mean_ns)}
-				ratio_text={entry.speedup_vs_canonical != null
-					? format_speedup(entry.speedup_vs_canonical)
-					: '1.0x'}
-				ratio_color={entry.speedup_vs_canonical != null
-					? speedup_color(entry.speedup_vs_canonical)
-					: 'var(--text_40)'}
-				annotation={format_coverage(entry.files_processed, entry.files_total)}
-			/>
-		{/each}
-	</div>
+	<BenchmarksBaselineGroup {rows} direction="speed" />
 </div>
diff --git a/src/routes/docs/benchmarks/BenchmarksMeta.svelte b/src/routes/docs/benchmarks/BenchmarksMeta.svelte
index 596ee77..b8968ce 100644
--- a/src/routes/docs/benchmarks/BenchmarksMeta.svelte
+++ b/src/routes/docs/benchmarks/BenchmarksMeta.svelte
@@ -1,22 +1,47 @@
 <script lang="ts">
-	import {site_context} from '@fuzdev/fuz_ui/site.svelte.ts';
+	import { site_context } from '@fuzdev/fuz_ui/site.svelte.ts';
 
-	import type {BenchmarkBaseline} from './benchmark_data.ts';
+	import { type BenchmarkBaseline, derive_corpus_repos } from './benchmark_data.ts';
 
 	const {
-		baseline,
+		baseline
 	}: {
 		baseline: BenchmarkBaseline;
 	} = $props();
 
 	const site = site_context.get();
 
+	const corpus_repos = $derived(derive_corpus_repos(baseline.corpus_sources));
+
+	// Display names for version keys whose underscore form isn't just hyphenation;
+	// everything else hyphenates (`oxc_parser` → `oxc-parser`).
+	const VERSION_LABELS: Record<string, string> = {
+		acorn_ts: 'acorn-typescript',
+		prettier_svelte: 'prettier-plugin-svelte',
+		// the wasm binding is its own scoped package, not a hyphenated suffix
+		yuku_parser_wasm: '@yuku-parser/wasm',
+		malva: 'dprint-plugin-malva',
+		swc: '@swc/core',
+		// the Svelte PARSE rows come from a package whose name says "vite plugin" —
+		// it's the N-API addon, and a different package from `@rsvelte/fmt`
+		rsvelte_parse: '@rsvelte/vite-plugin-svelte-native',
+		// not a tool version at all: the upstream Svelte that addon targets, worth
+		// showing beside the svelte pin the oracle row uses
+		rsvelte_parse_svelte_target: "rsvelte's upstream svelte"
+	};
+
+	// every tool version the report carries, in report order, so a tool added
+	// upstream appears without a site edit — tsv itself renders under "run"
+	const versions = $derived(
+		Object.entries(baseline.versions).filter(([key, version]) => key !== 'tsv' && version != null)
+	);
+
 	const formatted_date = $derived(
 		new Date(baseline.timestamp).toLocaleDateString('en-US', {
 			year: 'numeric',
 			month: 'long',
-			day: 'numeric',
-		}),
+			day: 'numeric'
+		})
 	);
 
 	// GitHub resolves abbreviated SHAs, so the short `git_commit` links directly.
@@ -25,7 +50,7 @@
 
 <div class="meta">
 	<div class="meta-section">
-		<h4 class="mt_0 mb_sm">corpus</h4>
+		<h4 class="mt_0 mb_sm">corpus stats</h4>
 		<ul>
 			{#each Object.entries(baseline.corpus) as [lang, count] (lang)}
 				<li>{lang}: {count} file{count !== 1 ? 's' : ''}</li>
@@ -35,20 +60,18 @@
 	<div class="meta-section">
 		<h4 class="mt_0 mb_sm">versions</h4>
 		<ul>
-			<li>svelte {baseline.versions.svelte}</li>
-			<li>acorn {baseline.versions.acorn}</li>
-			<li>acorn-typescript {baseline.versions.acorn_ts}</li>
-			<li>prettier {baseline.versions.prettier}</li>
-			<li>prettier-plugin-svelte {baseline.versions.prettier_svelte}</li>
-			<li>oxc-parser {baseline.versions.oxc_parser}</li>
-			<li>oxfmt {baseline.versions.oxfmt}</li>
-			<li>biome {baseline.versions.biome}</li>
+			{#each versions as [key, version] (key)}
+				<li>{VERSION_LABELS[key] ?? key.replaceAll('_', '-')} {version}</li>
+			{/each}
 		</ul>
 	</div>
 	<div class="meta-section">
 		<h4 class="mt_0 mb_sm">run</h4>
 		<ul>
 			<li>{formatted_date}</li>
+			{#if baseline.runtime}
+				<li>runtime: {baseline.runtime}</li>
+			{/if}
 			{#if baseline.versions.tsv}
 				<li>tsv {baseline.versions.tsv}</li>
 			{/if}
@@ -58,6 +81,33 @@
 			</li>
 		</ul>
 	</div>
+	{#if baseline.machine}
+		<div class="meta-section">
+			<h4 class="mt_0 mb_sm">environment</h4>
+			<ul>
+				<li>{baseline.machine.cpu_model}</li>
+				<li>{baseline.machine.os}/{baseline.machine.arch}</li>
+				{#if baseline.runtime}
+					<li>{baseline.runtime} {baseline.machine.runtime_version}</li>
+				{:else}
+					<li>{baseline.machine.runtime_version}</li>
+				{/if}
+			</ul>
+		</div>
+	{/if}
+	{#if corpus_repos.length}
+		<div class="meta-section corpus-repos">
+			<h4 class="mt_0 mb_sm">corpus repos</h4>
+			<ul class="repos">
+				{#each corpus_repos as repo (repo.url)}
+					<li>
+						<!-- eslint-disable-next-line svelte/no-navigation-without-resolve -->
+						<a href={repo.url}>{repo.label}</a>
+					</li>
+				{/each}
+			</ul>
+		</div>
+	{/if}
 </div>
 
 <style>
@@ -73,4 +123,14 @@
 		padding: 0;
 		margin: 0;
 	}
+	/* the repos list spans its own row below the compact stat columns and wraps horizontally */
+	.corpus-repos {
+		flex-basis: 100%;
+	}
+	.repos {
+		display: flex;
+		flex-wrap: wrap;
+		column-gap: var(--space_lg);
+		row-gap: var(--space_xs);
+	}
 </style>
diff --git a/src/routes/docs/benchmarks/BenchmarksSizes.svelte b/src/routes/docs/benchmarks/BenchmarksSizes.svelte
index ad9df5f..577625d 100644
--- a/src/routes/docs/benchmarks/BenchmarksSizes.svelte
+++ b/src/routes/docs/benchmarks/BenchmarksSizes.svelte
@@ -2,83 +2,54 @@
 	import {
 		format_bytes,
 		format_gzip_size,
-		categorize_size,
-		size_ratio_color,
-		type BinarySize,
+		derive_size_groups,
+		type BaselineRow,
+		type BinarySize
 	} from './benchmark_data.ts';
-	import BenchmarksBar from './BenchmarksBar.svelte';
+	import BenchmarksBaselineGroup from './BenchmarksBaselineGroup.svelte';
 
 	const {
-		sizes,
+		sizes
 	}: {
 		sizes: Array<BinarySize>;
 	} = $props();
 
-	const wasm_sizes = $derived(sizes.filter((s) => s.kind === 'wasm'));
-	const native_sizes = $derived(sizes.filter((s) => s.kind === 'native'));
+	// grouped by capability (full toolchain / formatter / parser) so each build
+	// sits beside its closest competitor; wasm and native mix within a group
+	const size_groups = $derived(derive_size_groups(sizes));
 
-	const make_display = (items: Array<BinarySize>) => {
-		const sorted = items.toSorted((a, b) => a.bytes - b.bytes);
-		const max = Math.max(0, ...items.map((s) => s.bytes));
-		// anchor "vs tsv" ratios on the headline build per kind - `tsv_wasm` (the
-		// flagship full build the bench executes) for wasm, `tsv (native)` for native —
-		// matching the report.md table; `tsv_format_wasm` covers reports generated
-		// before shape v2 added the third build, then any tsv-prefixed label.
-		// Without this the wasm group anchors on whatever sorts largest and every
-		// ratio disagrees with the report.
-		const tsv =
-			sorted.find((s) => s.label === 'tsv_wasm' || s.label === 'tsv (native)') ??
-			sorted.find((s) => s.label === 'tsv_format_wasm') ??
-			sorted.find((s) => s.label.startsWith('tsv'));
-		return sorted.map((s) => ({
-			...s,
-			bar_fraction: max > 0 ? s.bytes / max : 0,
-			ratio_vs_tsv: tsv && s !== tsv ? s.bytes / tsv.bytes : undefined,
-			category: categorize_size(s.label),
+	// a disabled placeholder (e.g. oxfmt's absent wasm build) has no gzip size of its
+	// own; when its group's other entries do carry one, fall back to 'n/a' rather than
+	// omitting the annotation entirely - otherwise that row drops the annotation
+	// column and its bar-track renders wider than its siblings'
+	const has_gzip = (entries: ReadonlyArray<{ gzip_bytes: number | null }>) =>
+		entries.some((e) => e.gzip_bytes != null);
+
+	const to_rows = (group: (typeof size_groups)[number]): Array<BaselineRow> => {
+		const group_has_gzip = has_gzip(group.entries);
+		return group.entries.map((s) => ({
+			key: s.label,
+			label: s.label,
+			category: s.category,
+			bar_fraction: s.bar_fraction,
+			value: format_bytes(s.bytes),
+			raw: s.bytes,
+			annotation: s.disabled
+				? group_has_gzip
+					? 'n/a'
+					: undefined
+				: format_gzip_size(s.gzip_bytes),
+			disabled: s.disabled ?? false
 		}));
 	};
-
-	const wasm_display = $derived(make_display(wasm_sizes));
-	const native_display = $derived(make_display(native_sizes));
 </script>
 
-{#if wasm_display.length > 0}
-	<div class="size-group">
-		<h3>wasm</h3>
-		<div class="column gap_xs">
-			{#each wasm_display as s (s.label)}
-				<BenchmarksBar
-					label={s.label}
-					bar_fraction={s.bar_fraction}
-					category={s.category}
-					value={format_bytes(s.bytes)}
-					ratio_text={s.ratio_vs_tsv != null ? `${s.ratio_vs_tsv.toFixed(1)}x` : '1.0x'}
-					ratio_color={s.ratio_vs_tsv != null ? size_ratio_color(s.ratio_vs_tsv) : 'var(--text_40)'}
-					annotation={format_gzip_size(s.gzip_bytes)}
-				/>
-			{/each}
-		</div>
-	</div>
-{/if}
-
-{#if native_display.length > 0}
+{#each size_groups as group (group.capability)}
 	<div class="size-group">
-		<h3>native</h3>
-		<div class="column gap_xs">
-			{#each native_display as s (s.label)}
-				<BenchmarksBar
-					label={s.label}
-					bar_fraction={s.bar_fraction}
-					category={s.category}
-					value={format_bytes(s.bytes)}
-					ratio_text={s.ratio_vs_tsv != null ? `${s.ratio_vs_tsv.toFixed(1)}x` : '1.0x'}
-					ratio_color={s.ratio_vs_tsv != null ? size_ratio_color(s.ratio_vs_tsv) : 'var(--text_40)'}
-					annotation={format_gzip_size(s.gzip_bytes)}
-				/>
-			{/each}
-		</div>
+		<h3>{group.heading}</h3>
+		<BenchmarksBaselineGroup rows={to_rows(group)} direction="size" />
 	</div>
-{/if}
+{/each}
 
 <style>
 	.size-group {
diff --git a/src/routes/docs/benchmarks/BenchmarksSummary.svelte b/src/routes/docs/benchmarks/BenchmarksSummary.svelte
index af3b40e..6902851 100644
--- a/src/routes/docs/benchmarks/BenchmarksSummary.svelte
+++ b/src/routes/docs/benchmarks/BenchmarksSummary.svelte
@@ -1,40 +1,29 @@
 <script lang="ts">
-	import {format_speedup, type BenchmarkGroup, type SpeedupRow} from './benchmark_data.ts';
+	import { format_speedup, type SpeedupRow } from './benchmark_data.ts';
 
 	const {
-		rows,
-		groups,
-		corpus,
+		rows
 	}: {
 		rows: Array<SpeedupRow>;
-		groups: Array<BenchmarkGroup>;
-		corpus: Record<string, number>;
 	} = $props();
-
-	// the speedups are measured on the per-group intersection (`files_iterated`),
-	// not the full discovered corpus — label the columns with the timed set,
-	// falling back to the corpus total on older baselines (< version 4)
-	const count_label = (language: string): string => {
-		const group = groups.find((g) => g.operation === 'format' && g.language === language);
-		const total = corpus[language] ?? 0;
-		return group?.files_iterated != null ? `${group.files_iterated} of ${total}` : `${total}`;
-	};
 </script>
 
 <p>
-	tsv is heavily inspired by and borrows architectural patterns from <a href="https://prettier.io/"
-		>Prettier</a
-	>. We're very grateful for the hard work of its
-	<a href="https://github.com/prettier/prettier/graphs/contributors">contributors</a>. tsv offers a
-	speedup over Prettier:
+	tsv's formatter is inspired by and borrows architectural patterns from <a
+		href="https://prettier.io/"
+	>
+		Prettier
+	</a>, and we're grateful for the hard work of its
+	<a href="https://github.com/prettier/prettier/graphs/contributors">contributors</a>.
+	Single-threaded on the benchmarked corpus, tsv is this much faster than Prettier:
 </p>
 <table>
 	<thead>
 		<tr>
 			<th></th>
-			<th class="color_h_50">Svelte<br /><small>{count_label('svelte')} files</small></th>
-			<th class="color_i_50">TypeScript<br /><small>{count_label('typescript')} files</small></th>
-			<th class="color_a_50">CSS<br /><small>{count_label('css')} files</small></th>
+			<th class="color_h_50">Svelte</th>
+			<th class="color_i_50">TypeScript</th>
+			<th class="color_a_50">CSS</th>
 		</tr>
 	</thead>
 	<tbody>
@@ -56,11 +45,6 @@
 	}
 	thead th {
 		padding: var(--space_xs) var(--space_sm);
-		font-size: var(--font_size_sm);
-	}
-	thead th small {
-		font-weight: 400;
-		opacity: 0.7;
 	}
 	tbody td {
 		padding: var(--space_xs) var(--space_sm);
@@ -72,6 +56,5 @@
 	.speedup {
 		font-size: var(--font_size_xl);
 		font-weight: 700;
-		font-variant-numeric: tabular-nums;
 	}
 </style>
diff --git a/src/routes/docs/benchmarks/benchmark_data.ts b/src/routes/docs/benchmarks/benchmark_data.ts
index 9bf0958..0b1947a 100644
--- a/src/routes/docs/benchmarks/benchmark_data.ts
+++ b/src/routes/docs/benchmarks/benchmark_data.ts
@@ -1,275 +1,1348 @@
-// Raw types matching the tsv bench.ts `Baseline` format
+// Raw types matching the tsv bench's per-runtime report format
+// (`benches/js/results/report.<runtime>.json` — the site's flagship detailed
+// view is the Node report, the N-API native path)
 
 export interface BenchmarkBaseline {
-	version: number;
-	timestamp: string;
-	git_commit: string;
-	corpus: Record<string, number>;
-	versions: BaselineVersions;
-	binary_sizes: Array<BinarySize>;
-	entries: Array<BaselineEntry>;
-	// Counts of silenced third-party stderr noise, keyed by message pattern.
-	// Present from baseline `version` 4 on; not rendered, kept for parity.
-	suppressed_noise?: Record<string, number>;
+  version: number;
+  // The runtime that produced this report (`node` for the flagship view).
+  // Present from report `version` 5 on.
+  runtime?: string;
+  timestamp: string;
+  git_commit: string;
+  corpus: Record<string, number>;
+  versions: BaselineVersions;
+  binary_sizes: Array<BinarySize>;
+  entries: Array<BaselineEntry>;
+  // Counts of silenced third-party stderr noise, keyed by message pattern.
+  // Present from baseline `version` 4 on; not rendered, kept for parity.
+  suppressed_noise?: Record<string, number>;
+  // Same-engine native/wasm pairs whose pre-flight accept sets or output bytes
+  // disagreed — `[]` when healthy. A non-empty list is a binding-boundary bug in
+  // the producing bench (see tsv's `check_variant_parity`), caught at review time
+  // in the copied report's diff; not rendered, kept for parity. Absent on
+  // older reports — treat as optional.
+  variant_parity?: Array<VariantParityFinding>;
+  // Which corpus/surface produced the report: `perf` (real-world corpus,
+  // format + parse) or `conformance` (the deliberately-hard fixture suites,
+  // disjoint from the perf corpus, parse only). Present from `version` 6 on.
+  corpus_kind?: "perf" | "conformance";
+  // Per-entry corpus composition (path + loaded file count) — discloses which
+  // sources were present on the machine that produced the report. Present
+  // from `version` 6 on.
+  corpus_sources?: Array<CorpusSource>;
+  // The machine that produced the report — CPU model, OS/arch, runtime version.
+  // The throughput numbers are machine-relative, so this is the environment the
+  // meta panel discloses. Present from `version` 7 on (absent on older reports).
+  machine?: Machine;
+  // Per-corpus-source coverage — `group → source → impl → {processed, total}`,
+  // the machine-readable half of the per-source tables in tsv's own markdown
+  // report. Conformance reports only (the perf surface is 100% by construction).
+  // Present from `version` 8 on; not rendered — this page shows each group's
+  // aggregate, which blends corpora answering different questions, so these rows
+  // are the sharper view if it ever grows one.
+  coverage_by_source?: Record<
+    string,
+    Record<string, Record<string, SourceCoverageCell>>
+  >;
+  // Artifacts the size table reached for and didn't find. That table's
+  // COMPOSITION varies by the producing machine — a row exists only for a built
+  // artifact — so this is what tells a missing row apart from an artifact that
+  // stopped being produced. Present from `version` 11 on; not rendered, kept for
+  // parity.
+  binary_sizes_absent?: Array<string>;
+  // Implementations that failed to initialize on the producing machine, as
+  // `{impl, reason, rows}`. An impl that doesn't load contributes NO row, so
+  // without this a tool that broke upstream is indistinguishable from one that was
+  // never measured (the Node report should be `[]`; Bun's carries its two known
+  // load failures). Present from `version` 10 on, `rows` from `version` 12; not
+  // rendered here, kept for parity.
+  unavailable?: Array<UnavailableImpl>;
+  // Files a byte-graded row ACCEPTED whose output the producing bench's
+  // byte-parity check could not digest, as `{"<group>/<row>": count}` — `{}` when
+  // every accepted output was gradeable, which is the healthy state. The one known
+  // cause is a pathologically deep AST overflowing V8's recursive `JSON.stringify`.
+  // Unlike every other field here it records a measurement the run could NOT make,
+  // so a growing count means that check is quietly covering less. Present from
+  // `version` 13 on; not rendered, kept for parity.
+  output_digest_ungraded?: Record<string, number>;
 }
 
+// Per-impl coverage for one corpus source (see `coverage_by_source`).
+export interface SourceCoverageCell {
+  processed: number;
+  total: number;
+}
+
+// One implementation that failed to load on the machine that produced a report
+// (see `BenchmarkBaseline.unavailable`). Mirrors the bench's `UnavailableImpl`.
+//
+// `impl` is the bench's init-line LABEL (`Biome`, `OXC WASM`) and matches no row
+// name — `rows` is the joinable identity, and the only one to look a row up by.
+export interface UnavailableImpl {
+  impl: string;
+  reason: string;
+  // The row names this failure removed from the tables. Absent on `version` 11
+  // and older reports.
+  rows?: Array<string>;
+}
+
+// A same-engine pair that disagreed — one engine behind two bindings
+// (native/wasm), or one binding under two options. Mirrors the bench's
+// `VariantParityFinding` (see `BenchmarkBaseline.variant_parity`); the
+// neutral keys arrived with report `version` 9, which is also when the check
+// started pairing options (older reports spell them `native`/`wasm`).
+export interface VariantParityFinding {
+  group: string;
+  impl: string;
+  sibling: string;
+  // files only `impl` accepted
+  impl_only: number;
+  // files only `sibling` accepted
+  sibling_only: number;
+  // files BOTH accepted whose outputs differ byte-for-byte, and up to three of
+  // their paths. Only tsv's own native/wasm pair is graded on bytes, and a
+  // non-zero count fails the producing bench outright, so these are absent
+  // here in practice — kept for parity with the report shape. Absent on
+  // reports older than the byte check; treat as optional.
+  output_mismatch?: number;
+  output_mismatch_examples?: Array<string>;
+}
+
+// The hardware/runtime a report was measured on. Excludes hostname (the reports
+// are published) and volatile fields (free memory, load) that would churn.
+export interface Machine {
+  cpu_model: string;
+  os: string;
+  arch: string;
+  // The producing runtime's own version (`node`/`deno`/`bun` version string).
+  runtime_version: string;
+}
+
+export interface CorpusSource {
+  path: string;
+  files: number;
+  // Per-language split of `files` (svelte/typescript/css counts summing to
+  // `files`). Present on reports whose loader emitted it; older reports carry
+  // only the `files` total, so treat it as optional.
+  by_language?: Partial<Record<string, number>>;
+  // The source's GitHub origin, git-detected by the bench at report-build time
+  // (URL + commit + subpath). Absent on older reports and on sources with no
+  // GitHub remote — presence keys on the field, not the report `version` (it
+  // arrived without one and is not tied to any), so treat it as optional.
+  repo?: CorpusRepoRef;
+}
+
+// A corpus source's GitHub origin — see `CorpusSource.repo` and `corpus_source_url`.
+export interface CorpusRepoRef {
+  // Canonical https GitHub URL, e.g. `https://github.com/sveltejs/svelte`.
+  url: string;
+  // `owner/name` (e.g. `sveltejs/svelte`) — a compact label.
+  slug: string;
+  // The commit the corpus was loaded at (full SHA); `''` for a harvested cache
+  // linked at its canonical upstream root (no pin).
+  commit: string;
+  // Path within the repo to this source (`''` = repo root).
+  subpath: string;
+}
+
+/**
+ * The GitHub URL for a corpus source, pinned to the measured commit + subpath
+ * (`…/tree/<commit>/<subpath>`) when detected, or the repo root for a
+ * canonical-upstream cache (empty `commit`). `undefined` when the source has no
+ * detected origin (older reports, or the local `svelte_styles` cache).
+ */
+export const corpus_source_url = (source: CorpusSource): string | undefined => {
+  const repo = source.repo;
+  if (!repo) return undefined;
+  if (!repo.commit) return repo.url;
+  return repo.subpath
+    ? `${repo.url}/tree/${repo.commit}/${repo.subpath}`
+    : `${repo.url}/tree/${repo.commit}`;
+};
+
 export interface BaselineEntry {
-	name: string;
-	group: string;
-	mean_ns: number;
-	p50_ns: number;
-	p75_ns: number;
-	p90_ns: number;
-	p95_ns: number;
-	p99_ns: number;
-	min_ns: number;
-	max_ns: number;
-	std_dev_ns: number;
-	cv: number;
-	ops_per_second: number;
-	sample_size: number;
-	// Per-implementation preflight coverage: files this impl processed / the
-	// language's total discovered files. Present from baseline `version` 3 on;
-	// absent (or `null`) in older baselines.
-	files_processed?: number | null;
-	files_total?: number | null;
-	// Files this impl was actually timed on (the per-group intersection in
-	// default mode). Present from baseline `version` 4 on.
-	files_iterated?: number | null;
+  name: string;
+  group: string;
+  // Timing stats are `null` on a coverage-only report (the conformance surface
+  // the site refreshes from — parse coverage measured, timed phase skipped). A
+  // perf report always carries real numbers, and only the perf path
+  // (`derive_benchmark_groups`) reads these, so the nulls are unreachable there
+  // but must be expressed for the shared cast to stay sound.
+  mean_ns: number | null;
+  p50_ns: number | null;
+  p75_ns: number | null;
+  p90_ns: number | null;
+  p95_ns: number | null;
+  p99_ns: number | null;
+  min_ns: number | null;
+  max_ns: number | null;
+  std_dev_ns: number | null;
+  cv: number | null;
+  ops_per_second: number | null;
+  sample_size: number | null;
+  // Per-implementation preflight coverage: files this impl processed / the
+  // language's total discovered files. Present from baseline `version` 3 on;
+  // absent (or `null`) in older baselines.
+  files_processed?: number | null;
+  files_total?: number | null;
+  // Files this impl was actually timed on (the per-group intersection in
+  // default mode). Present from baseline `version` 4 on.
+  files_iterated?: number | null;
+  // Present from report `version` 5 on (matches the report's top-level);
+  // not rendered, kept for parity.
+  runtime?: string;
 }
 
 export interface BaselineVersions {
-	tsv: string;
-	svelte: string;
-	acorn: string;
-	acorn_ts: string;
-	prettier: string;
-	prettier_svelte: string;
-	oxc_parser?: string;
-	oxfmt?: string;
-	biome?: string;
+  tsv: string;
+  svelte: string;
+  acorn: string;
+  acorn_ts: string;
+  prettier: string;
+  prettier_svelte: string;
+  oxc_parser?: string;
+  oxfmt?: string;
+  // `yuku-parser` (N-API) and `@yuku-parser/wasm` — one Zig engine behind two
+  // bindings, versioned in lockstep upstream. Absent on reports produced before
+  // the yuku rows.
+  yuku_parser?: string;
+  yuku_parser_wasm?: string;
+  biome?: string;
+  // `@dprint/typescript` — the plugin version (the host `@dprint/formatter` is
+  // just the Wasm loader). Absent on reports produced before the dprint row.
+  dprint?: string;
+  // `@rsvelte/fmt` — the coverage-only Svelte formatter row. Absent on reports
+  // produced before the rsvelte-fmt row.
+  rsvelte_fmt?: string;
+  // `dprint-plugin-malva` — dprint's CSS formatter plugin, over the same Wasm
+  // host as `dprint` above. Absent on reports produced before the malva row.
+  malva?: string;
+  // `postcss` — the CSS parser row. Absent on reports produced before it.
+  postcss?: string;
+  // `@rsvelte/vite-plugin-svelte-native` — the N-API addon behind the Svelte
+  // PARSE rows, a different package from `@rsvelte/fmt` above and versioned
+  // independently. Absent on reports produced before those rows.
+  rsvelte_parse?: string;
+  // The upstream Svelte version that addon targets (its own `VERSION` export),
+  // which is not its package version — a drift from the `svelte` pin means those
+  // rows parse to a different Svelte than the svelte/compiler row beside them.
+  rsvelte_parse_svelte_target?: string;
+  // `@swc/core` — the TypeScript/JS parser row. Absent on reports produced
+  // before it.
+  swc?: string;
 }
 
 export interface BinarySize {
-	label: string;
-	bytes: number;
-	kind: 'native' | 'wasm';
-	// Gzipped on-disk size (≈ npm-tarball wire size); `null` when `gzip` was
-	// unavailable on the machine that generated the baseline.
-	gzip_bytes: number | null;
+  label: string;
+  bytes: number;
+  kind: "native" | "wasm";
+  // Gzipped on-disk size (≈ npm-tarball wire size); `null` when `gzip` was
+  // unavailable on the machine that generated the baseline.
+  gzip_bytes: number | null;
 }
 
 // Display types
 
 export type ImplementationCategory =
-	| 'canonical'
-	| 'tsv_native'
-	| 'tsv_native_json'
-	| 'tsv_wasm'
-	| 'tsv_wasm_json'
-	| 'biome'
-	| 'oxc';
+  | "canonical"
+  | "tsv_native"
+  | "tsv_native_json"
+  | "tsv_wasm"
+  | "tsv_wasm_json"
+  | "biome"
+  | "dprint"
+  | "oxc"
+  | "postcss"
+  | "rsvelte"
+  | "swc"
+  | "yuku";
 
 export interface BenchmarkGroup {
-	operation: string;
-	language: string;
-	entries: Array<BenchmarkDisplayEntry>;
-	canonical_entry: BenchmarkDisplayEntry | undefined;
-	// files the timed benchmark actually iterated (the per-group intersection);
-	// null on older baselines (< version 4) that don't carry `files_iterated`
-	files_iterated: number | null;
+  operation: string;
+  language: string;
+  entries: Array<BenchmarkDisplayEntry>;
+  canonical_entry: BenchmarkDisplayEntry | undefined;
+  // files the timed benchmark actually iterated (the per-group intersection);
+  // null on older baselines (< version 4) that don't carry `files_iterated`
+  files_iterated: number | null;
 }
 
 export interface BenchmarkDisplayEntry {
-	name: string;
-	mean_ns: number;
-	bar_fraction: number;
-	speedup_vs_canonical: number | undefined;
-	category: ImplementationCategory;
-	files_processed: number | null;
-	files_total: number | null;
+  name: string;
+  mean_ns: number;
+  bar_fraction: number;
+  category: ImplementationCategory;
+  files_processed: number | null;
+  files_total: number | null;
+  // A placeholder entry mirrored from another language's group for a tool that
+  // doesn't run in this one (e.g. `oxc-parser` under svelte/css parse) — rendered
+  // grayed-out and inert so the parse groups share one entry order. Absent on real,
+  // measured entries. Also set on a `coverage_only` row, which shares the inert
+  // rendering for a different reason (see below).
+  disabled?: boolean;
+  // The harness measured this tool's COVERAGE but deliberately never timed it —
+  // it ships no in-process API, so a per-file row would have measured process
+  // spawn rather than format work (`rsvelte-fmt`; see the tsv harness's
+  // §Coverage-only rows). Distinct from a plain `disabled` placeholder: that one
+  // never ran here at all, while this one ran over the whole corpus and has real
+  // `files_processed`/`files_total` to show. Both render inert; only this one
+  // carries a coverage annotation and needs the page to explain itself.
+  coverage_only?: boolean;
 }
 
 export interface SpeedupRow {
-	variant: string;
-	format_svelte: number | undefined;
-	format_typescript: number | undefined;
-	format_css: number | undefined;
+  variant: string;
+  format_svelte: number | undefined;
+  format_typescript: number | undefined;
+  format_css: number | undefined;
 }
 
 // Implementation categorization
 
 const CATEGORY_BY_NAME: Record<string, ImplementationCategory> = {
-	prettier: 'canonical',
-	'svelte/compiler': 'canonical',
-	'acorn-typescript': 'canonical',
-	tsv: 'tsv_native',
-	'tsv-json': 'tsv_native_json',
-	'tsv-internal': 'tsv_native',
-	tsv_wasm: 'tsv_wasm',
-	'tsv_wasm-json': 'tsv_wasm_json',
-	'tsv_wasm-internal': 'tsv_wasm',
-	'biome-wasm': 'biome',
-	'oxc-parser': 'oxc',
-	'oxc-parser-wasm': 'oxc',
-	oxfmt: 'oxc',
-};
-
-const categorize_name = (name: string): ImplementationCategory => CATEGORY_BY_NAME[name] ?? 'oxc';
-
-export const categorize_size = (label: string): ImplementationCategory => {
-	// covers `tsv_wasm` plus the `tsv_format_wasm`/`tsv_parse_wasm` subsets
-	if (label.startsWith('tsv') && label.includes('wasm')) return 'tsv_wasm';
-	if (label.startsWith('tsv')) return 'tsv_native';
-	if (label.startsWith('biome')) return 'biome';
-	if (label.includes('oxc') || label.includes('oxfmt')) return 'oxc';
-	return 'oxc';
+  prettier: "canonical",
+  "svelte/compiler": "canonical",
+  "acorn-typescript": "canonical",
+  tsv: "tsv_native",
+  "tsv-json": "tsv_native_json",
+  "tsv-json-no-locations": "tsv_native_json",
+  "tsv-internal": "tsv_native",
+  tsv_wasm: "tsv_wasm",
+  "tsv_wasm-json": "tsv_wasm_json",
+  "tsv_wasm-json-no-locations": "tsv_wasm_json",
+  "tsv_wasm-internal": "tsv_wasm",
+  "biome-wasm": "biome",
+  "dprint-wasm": "dprint",
+  // malva is dprint's own CSS plugin, loaded through the same Wasm host, so it
+  // shares dprint's category rather than claiming a hue of its own — the palette
+  // has ten and all ten are spoken for.
+  "malva-wasm": "dprint",
+  "oxc-parser": "oxc",
+  "oxc-parser-wasm": "oxc",
+  oxfmt: "oxc",
+  postcss: "postcss",
+  "rsvelte-fmt": "rsvelte",
+  // The parse rows come from a different package than `rsvelte-fmt`, but the same
+  // tool, so one category covers all three.
+  "rsvelte-parse": "rsvelte",
+  "rsvelte-parse-skip-expr-loc": "rsvelte",
+  swc: "swc",
+  "yuku-parser": "yuku",
+  "yuku-parser-wasm": "yuku",
 };
 
-// Canonical entry names per group
-const CANONICAL_BY_GROUP: Record<string, string> = {
-	'parse/svelte': 'svelte/compiler',
-	'parse/typescript': 'acorn-typescript',
-	'parse/css': 'svelte/compiler',
-	'format/svelte': 'prettier',
-	'format/typescript': 'prettier',
-	'format/css': 'prettier',
+export const categorize_name = (name: string): ImplementationCategory =>
+  CATEGORY_BY_NAME[name] ?? "oxc";
+
+export const categorize_size = (label: string): ImplementationCategory => {
+  // covers `tsv_wasm` plus the `tsv_format_wasm`/`tsv_parse_wasm` subsets
+  if (label.startsWith("tsv") && label.includes("wasm")) return "tsv_wasm";
+  if (label.startsWith("tsv")) return "tsv_native";
+  if (label.startsWith("biome")) return "biome";
+  if (label.startsWith("dprint")) return "dprint";
+  if (label.startsWith("malva")) return "dprint"; // dprint's CSS plugin — see CATEGORY_BY_NAME
+  // Covers both `rsvelte-fmt (binary)` and `rsvelte compiler (napi)`.
+  if (label.startsWith("rsvelte")) return "rsvelte";
+  if (label.startsWith("swc")) return "swc";
+  if (label.startsWith("yuku")) return "yuku";
+  return "oxc"; // oxc-parser / oxfmt, and any unrecognized label
 };
 
 // Primary tsv entry names for speedup summary (fair comparisons)
-const PRIMARY_NATIVE_FORMAT = 'tsv';
-const PRIMARY_WASM_FORMAT = 'tsv_wasm';
+const PRIMARY_NATIVE_FORMAT = "tsv";
+const PRIMARY_WASM_FORMAT = "tsv_wasm";
 
 // Derivation functions
 
-export const derive_benchmark_groups = (baseline: BenchmarkBaseline): Array<BenchmarkGroup> => {
-	const grouped: Map<string, Array<BaselineEntry>> = new Map();
-	for (const entry of baseline.entries) {
-		let group = grouped.get(entry.group);
-		if (!group) {
-			group = [];
-			grouped.set(entry.group, group);
-		}
-		group.push(entry);
-	}
-
-	const result: Array<BenchmarkGroup> = [];
-
-	for (const [group_key, entries] of grouped) {
-		const parts = group_key.split('/');
-		const operation = parts[0]!;
-		const language = parts[1]!;
-		const canonical_name = CANONICAL_BY_GROUP[group_key];
-		const canonical_entry_raw = entries.find((e) => e.name === canonical_name);
-		const slowest = Math.max(...entries.map((e) => e.mean_ns));
-
-		const display_entries: Array<BenchmarkDisplayEntry> = entries.map((e) => ({
-			name: e.name,
-			mean_ns: e.mean_ns,
-			bar_fraction: slowest > 0 ? e.mean_ns / slowest : 0,
-			speedup_vs_canonical:
-				canonical_entry_raw && e.name !== canonical_name
-					? canonical_entry_raw.mean_ns / e.mean_ns
-					: undefined,
-			category: categorize_name(e.name),
-			files_processed: e.files_processed ?? null,
-			files_total: e.files_total ?? null,
-		}));
-
-		// Sort: canonical first, then by mean_ns descending (slowest first for visual)
-		display_entries.sort((a, b) => {
-			if (a.category === 'canonical' && b.category !== 'canonical') return -1;
-			if (b.category === 'canonical' && a.category !== 'canonical') return 1;
-			return b.mean_ns - a.mean_ns;
-		});
-
-		const iterated_counts = entries
-			.map((e) => e.files_iterated)
-			.filter((v): v is number => v != null);
-		result.push({
-			operation,
-			language,
-			entries: display_entries,
-			canonical_entry: display_entries.find((e) => e.category === 'canonical'),
-			files_iterated: iterated_counts.length > 0 ? Math.max(...iterated_counts) : null,
-		});
-	}
-
-	// Sort groups: format before parse, then by language
-	const LANG_ORDER: Record<string, number> = {svelte: 0, typescript: 1, css: 2};
-	const OP_ORDER: Record<string, number> = {format: 0, parse: 1};
-	result.sort(
-		(a, b) =>
-			(OP_ORDER[a.operation] ?? 9) - (OP_ORDER[b.operation] ?? 9) ||
-			(LANG_ORDER[a.language] ?? 9) - (LANG_ORDER[b.language] ?? 9),
-	);
-
-	return result;
-};
-
-export const derive_speedup_summary = (groups: Array<BenchmarkGroup>): Array<SpeedupRow> => {
-	const find_speedup = (
-		operation: string,
-		language: string,
-		primary_name: string,
-	): number | undefined => {
-		const group = groups.find((g) => g.operation === operation && g.language === language);
-		if (!group?.canonical_entry) return undefined;
-		const entry = group.entries.find((e) => e.name === primary_name);
-		if (!entry) return undefined;
-		return group.canonical_entry.mean_ns / entry.mean_ns;
-	};
-
-	return [
-		{
-			variant: 'native',
-			format_svelte: find_speedup('format', 'svelte', PRIMARY_NATIVE_FORMAT),
-			format_typescript: find_speedup('format', 'typescript', PRIMARY_NATIVE_FORMAT),
-			format_css: find_speedup('format', 'css', PRIMARY_NATIVE_FORMAT),
-		},
-		{
-			variant: 'wasm',
-			format_svelte: find_speedup('format', 'svelte', PRIMARY_WASM_FORMAT),
-			format_typescript: find_speedup('format', 'typescript', PRIMARY_WASM_FORMAT),
-			format_css: find_speedup('format', 'css', PRIMARY_WASM_FORMAT),
-		},
-	];
+// Shared display order for benchmark groups: format before parse, then by
+// language — used by the detailed, conformance, and cross-runtime views alike.
+const OPERATION_ORDER: Record<string, number> = { format: 0, parse: 1 };
+const LANGUAGE_ORDER: Record<string, number> = {
+  svelte: 0,
+  typescript: 1,
+  css: 2,
+};
+
+/**
+ * Fixed slot for a format/parse row, applied in place of a size-ordered sort so the
+ * rows read in a stable, meaningful sequence across every group: the canonical
+ * reference first (the default 1.0x anchor), then the cross-tool comparisons
+ * (alphabetically: biome, dprint — whose category malva shares — oxc, postcss,
+ * rsvelte, swc, yuku), then tsv's JSON-materializing
+ * wires (the span-only `no-locations` wire before the default `loc`-carrying one),
+ * then tsv's raw internal engine.
+ */
+const speed_entry_rank = (entry: BenchmarkDisplayEntry): number => {
+  if (entry.category === "canonical") return 0;
+  if (entry.category === "biome") return 1;
+  if (entry.category === "dprint") return 2;
+  if (entry.category === "oxc") return 3;
+  if (entry.category === "postcss") return 4;
+  if (entry.category === "rsvelte") return 5;
+  if (entry.category === "swc") return 6;
+  if (entry.category === "yuku") return 7;
+  if (entry.name.endsWith("-no-locations")) return 8; // tsv json, span-only wire
+  if (entry.name.endsWith("-json")) return 9; // tsv json, loc-carrying wire
+  return 10; // tsv-internal / tsv_wasm-internal — raw in-engine, no JS materialization
+};
+
+/**
+ * Orders format/parse rows by their fixed `speed_entry_rank` slot, then wasm before
+ * native within a tier (the browser-relevant build leads each pairing), then by name
+ * — shared by the initial sort and the re-sort after disabled placeholders are mixed
+ * in, so every group scans identically.
+ */
+const compare_speed_entries = (
+  a: BenchmarkDisplayEntry,
+  b: BenchmarkDisplayEntry,
+): number => {
+  const rank = speed_entry_rank(a) - speed_entry_rank(b);
+  if (rank !== 0) return rank;
+  // wasm before native within a tier
+  const kind =
+    (a.name.includes("wasm") ? 0 : 1) - (b.name.includes("wasm") ? 0 : 1);
+  if (kind !== 0) return kind;
+  return a.name.localeCompare(b.name);
+};
+
+export const derive_benchmark_groups = (
+  baseline: BenchmarkBaseline,
+): Array<BenchmarkGroup> => {
+  const grouped: Map<string, Array<BaselineEntry>> = new Map();
+  for (const entry of baseline.entries) {
+    let group = grouped.get(entry.group);
+    if (!group) {
+      group = [];
+      grouped.set(entry.group, group);
+    }
+    group.push(entry);
+  }
+
+  const result: Array<BenchmarkGroup> = [];
+
+  for (const [group_key, entries] of grouped) {
+    const parts = group_key.split("/");
+    const operation = parts[0]!;
+    const language = parts[1]!;
+    // The sort below leads each group with its canonical reference (Prettier for
+    // format, the JS baseline for parse), so the first row is the default 1.0x
+    // anchor; the shared component reads that default off the first row and
+    // recomputes every ratio, re-baselining onto whichever row is hovered. (Size
+    // groups lead with their smallest build; see `derive_size_groups`.)
+    // `?? 0` coerces a null timing so the display entry's `mean_ns` stays a
+    // number. On a perf report the nulls are exactly the COVERAGE-ONLY rows —
+    // a tool measured for what it accepts but never timed (see
+    // `BenchmarkDisplayEntry.coverage_only`) — and a 0 there is inert: those
+    // rows render without a bar, value, or ratio, so the coerced number is
+    // never displayed or divided by. It does keep them out of `slowest`, which
+    // is what we want — a row with no timing must not set the bar scale.
+    const slowest = Math.max(...entries.map((e) => e.mean_ns ?? 0));
+
+    const display_entries: Array<BenchmarkDisplayEntry> = entries.map((e) => {
+      // `mean_ns` is the timing the bars and ratios are built from, so its
+      // absence — not the tool's identity — is what marks a row untimed. That
+      // keeps this independent of which tools happen to be coverage-only.
+      const untimed = e.mean_ns == null;
+      return {
+        name: e.name,
+        mean_ns: e.mean_ns ?? 0,
+        bar_fraction: untimed || slowest <= 0 ? 0 : (e.mean_ns ?? 0) / slowest,
+        category: categorize_name(e.name),
+        files_processed: e.files_processed ?? null,
+        files_total: e.files_total ?? null,
+        ...(untimed ? { disabled: true, coverage_only: true } : null),
+      };
+    });
+
+    // Fixed order (see `compare_speed_entries`): canonical leads as the default 1.0x
+    // anchor, then biome, oxc, tsv's json wires, then tsv's internal engine
+    display_entries.sort(compare_speed_entries);
+
+    const iterated_counts = entries
+      .map((e) => e.files_iterated)
+      .filter((v): v is number => v != null);
+    result.push({
+      operation,
+      language,
+      entries: display_entries,
+      canonical_entry: display_entries.find((e) => e.category === "canonical"),
+      files_iterated:
+        iterated_counts.length > 0 ? Math.max(...iterated_counts) : null,
+    });
+  }
+
+  result.sort(
+    (a, b) =>
+      (OPERATION_ORDER[a.operation] ?? 9) -
+        (OPERATION_ORDER[b.operation] ?? 9) ||
+      (LANGUAGE_ORDER[a.language] ?? 9) - (LANGUAGE_ORDER[b.language] ?? 9),
+  );
+
+  // Neither `biome` nor (for svelte/css) `oxc-parser` has a real entry in every
+  // parse group. `biome`'s `@biomejs/js-api` never exposes a parser to JS at all
+  // (only formatting and linting), so no parse group has a real biome entry;
+  // `oxc-parser` only parses TypeScript/JS, so the svelte and css parse groups
+  // lack it. Mirror both in as disabled placeholders — biome always, oxc-parser
+  // only where it's missing — then re-sort so they fall into their fixed slots
+  // (biome then oxc, right after the canonical row), giving all three parse groups
+  // one shared entry order.
+  //
+  // `yuku-parser` is deliberately NOT mirrored, though it is TypeScript/JS-only too.
+  // A grayed-out slot states a SCOPE gap: biome and oxc are broad web toolchains, so
+  // a missing Svelte or CSS parser is worth showing. yuku claims nothing wider, so
+  // an empty slot would invent a shortfall against a promise it never made.
+  const ts_parse = result.find(
+    (g) => g.operation === "parse" && g.language === "typescript",
+  );
+  const oxc_templates =
+    ts_parse?.entries.filter((e) => e.category === "oxc") ?? [];
+  for (const group of result) {
+    if (group.operation !== "parse") continue;
+    const biome_placeholder: BenchmarkDisplayEntry = {
+      name: "biome-wasm",
+      mean_ns: 0,
+      bar_fraction: 0,
+      category: "biome",
+      files_processed: null,
+      files_total: null,
+      disabled: true,
+    };
+    const needs_oxc =
+      group.language !== "typescript" &&
+      !group.entries.some((e) => e.category === "oxc");
+    const oxc_placeholders: Array<BenchmarkDisplayEntry> = needs_oxc
+      ? oxc_templates.map((e) => ({
+          ...e,
+          bar_fraction: 0,
+          files_processed: null,
+          files_total: null,
+          disabled: true,
+        }))
+      : [];
+    group.entries.push(biome_placeholder, ...oxc_placeholders);
+    group.entries.sort(compare_speed_entries);
+  }
+
+  // The format-side analogue: `@dprint/typescript` formats TypeScript/JS only and
+  // rejects Svelte outright, so the svelte FORMAT group has no real dprint entry.
+  // Mirror it in as a disabled placeholder so the format groups share one entry
+  // order, exactly as oxc-parser is mirrored into the svelte/css parse groups
+  // above. css is NOT filled: the bench runs dprint's own CSS plugin, malva,
+  // through the same Wasm host, and that row shares dprint's category
+  // (`CATEGORY_BY_NAME`), so the "no dprint-category entry" guard below already
+  // leaves it alone. Guarded on the template existing, so a report predating the
+  // dprint row renders unchanged.
+  const ts_format = result.find(
+    (g) => g.operation === "format" && g.language === "typescript",
+  );
+  const dprint_templates =
+    ts_format?.entries.filter((e) => e.category === "dprint") ?? [];
+  if (dprint_templates.length > 0) {
+    for (const group of result) {
+      if (group.operation !== "format") continue;
+      if (group.entries.some((e) => e.category === "dprint")) continue;
+      group.entries.push(
+        ...dprint_templates.map((e) => ({
+          ...e,
+          bar_fraction: 0,
+          files_processed: null,
+          files_total: null,
+          disabled: true,
+        })),
+      );
+      group.entries.sort(compare_speed_entries);
+    }
+  }
+
+  return result;
+};
+
+// Parse-conformance coverage (the conformance report's headline metric)
+
+export interface ConformanceRow {
+  name: string;
+  // dimmed qualifier rendered beside the name, for the one case where WHICH
+  // binding produced the row is worth saying — see `CONFORMANCE_ROW_NOTES`
+  note?: string;
+  files_processed: number;
+  files_total: number;
+  // files_processed / files_total, rendered as the coverage percentage
+  coverage_fraction: number;
+}
+
+export interface ConformanceGroup {
+  language: string;
+  // the language's total discovered files (every row shares it)
+  files_total: number;
+  rows: Array<ConformanceRow>;
+}
+
+/**
+ * One coverage row per ENGINE, not per binding: the conformance headline is
+ * "which files does this parser accept," which is identical across a tool's
+ * native/wasm/internal variants — so the `-wasm` and `-internal` duplicates
+ * are dropped and `tsv-json` stands in for tsv (relabeled plainly, since the
+ * JSON-materialization qualifier is a speed concern, not a coverage one).
+ *
+ * Which binding stands in is therefore arbitrary — except for yuku, where the
+ * conformance report carries the wasm row alone: its native binding crashes the
+ * host process on this corpus's escaped-identifier tests, so tsv's harness omits
+ * that row there. Keying on `yuku-parser` would silently drop the engine.
+ */
+const CONFORMANCE_ENGINE_NAMES: Record<string, string> = {
+  "svelte/compiler": "svelte/compiler",
+  "acorn-typescript": "acorn-typescript",
+  "tsv-json": "tsv",
+  "oxc-parser": "oxc-parser",
+  "yuku-parser-wasm": "yuku-parser",
+  // rsvelte's two parse rows are one engine under two options, so only the
+  // default-wire one stands in — the option changes the payload, never the
+  // verdict.
+  "rsvelte-parse": "rsvelte",
+  swc: "swc",
+  // The TypeScript compiler's own parser, which appears on this surface alone —
+  // a verdict rather than a speed, so it carries no throughput row. Its reading
+  // changes by corpus source, which the note below spells out.
+  tsc: "tsc",
+  postcss: "PostCSS",
+};
+
+/**
+ * Qualifiers rendered beside a coverage row, keyed by report entry name. The
+ * table is per engine and says nothing about bindings — so a note here is for
+ * when the row's reading needs a caveat the coverage number can't carry, whether
+ * that's the binding or the grammar being measured.
+ */
+const CONFORMANCE_ROW_NOTES: Record<string, string> = {
+  "yuku-parser-wasm": "wasm — native segfaults",
+  // tsc selected part of this corpus, where it therefore scores 100% by
+  // construction — the same shape as svelte/compiler on the Svelte set, but
+  // invisible here because it holds for only a SLICE of the TypeScript group
+  // rather than the whole of it. Without the note the blended number reads as
+  // one achieved result, and its shortfall reads as a defect in the corpus
+  // rather than as the corpora tsc never selected. Spelled out below the tables.
+  tsc: "oracle for part of this corpus",
+  // The CSS group's reference row is svelte/compiler's `parseCss`, which is not a
+  // validity oracle in either direction — so PostCSS sitting slightly above it is
+  // a grammar difference, not a conformance verdict. Spelled out in the notes
+  // below the tables.
+  postcss: "a different CSS grammar",
+};
+
+/**
+ * Derives per-language parse-coverage groups from a conformance report
+ * (`corpus_kind: 'conformance'` — parse groups only). Rows are ordered by coverage,
+ * highest first; entries without coverage data are dropped.
+ */
+export const derive_conformance_groups = (
+  baseline: BenchmarkBaseline,
+): Array<ConformanceGroup> => {
+  const by_language: Map<string, Array<ConformanceRow>> = new Map();
+  for (const entry of baseline.entries) {
+    const [operation, language] = entry.group.split("/");
+    if (operation !== "parse" || !language) continue;
+    const display_name = CONFORMANCE_ENGINE_NAMES[entry.name];
+    if (!display_name) continue;
+    if (entry.files_processed == null || entry.files_total == null) continue;
+    let rows = by_language.get(language);
+    if (!rows) {
+      rows = [];
+      by_language.set(language, rows);
+    }
+    rows.push({
+      name: display_name,
+      note: CONFORMANCE_ROW_NOTES[entry.name],
+      files_processed: entry.files_processed,
+      files_total: entry.files_total,
+      coverage_fraction:
+        entry.files_total > 0 ? entry.files_processed / entry.files_total : 0,
+    });
+  }
+
+  const result: Array<ConformanceGroup> = [];
+  for (const [language, rows] of by_language) {
+    // coverage descending (highest acceptance first), name as a stable tiebreak
+    rows.sort(
+      (a, b) =>
+        b.coverage_fraction - a.coverage_fraction ||
+        a.name.localeCompare(b.name),
+    );
+    result.push({
+      language,
+      files_total: Math.max(0, ...rows.map((r) => r.files_total)),
+      rows,
+    });
+  }
+  result.sort(
+    (a, b) =>
+      (LANGUAGE_ORDER[a.language] ?? 9) - (LANGUAGE_ORDER[b.language] ?? 9),
+  );
+  return result;
+};
+
+/**
+ * Formats a coverage fraction as a percentage with two decimals (`99.85%`),
+ * FLOORED rather than rounded — rounding would render e.g. 44219/44220 as
+ * `100.00%` next to a visibly non-total count. Only exact totality reads 100%
+ * (matching the harness's own `coverage_pct` convention in tsv's report.ts).
+ */
+export const format_coverage_percent = (fraction: number): string =>
+  `${(Math.floor(fraction * 10_000) / 100).toFixed(2)}%`;
+
+export const derive_speedup_summary = (
+  groups: Array<BenchmarkGroup>,
+): Array<SpeedupRow> => {
+  const find_speedup = (
+    operation: string,
+    language: string,
+    primary_name: string,
+  ): number | undefined => {
+    const group = groups.find(
+      (g) => g.operation === operation && g.language === language,
+    );
+    if (!group?.canonical_entry) return undefined;
+    const entry = group.entries.find((e) => e.name === primary_name);
+    if (!entry) return undefined;
+    return group.canonical_entry.mean_ns / entry.mean_ns;
+  };
+
+  return [
+    {
+      variant: "native",
+      format_svelte: find_speedup("format", "svelte", PRIMARY_NATIVE_FORMAT),
+      format_typescript: find_speedup(
+        "format",
+        "typescript",
+        PRIMARY_NATIVE_FORMAT,
+      ),
+      format_css: find_speedup("format", "css", PRIMARY_NATIVE_FORMAT),
+    },
+    {
+      variant: "wasm",
+      format_svelte: find_speedup("format", "svelte", PRIMARY_WASM_FORMAT),
+      format_typescript: find_speedup(
+        "format",
+        "typescript",
+        PRIMARY_WASM_FORMAT,
+      ),
+      format_css: find_speedup("format", "css", PRIMARY_WASM_FORMAT),
+    },
+  ];
+};
+
+// Binary-size grouping by capability
+
+/** What a build actually does, used to group binary sizes for like-for-like comparison. */
+export type SizeCapability = "full" | "formatter" | "parser";
+
+/**
+ * Capability for the labels whose NAME doesn't say what the build does, so the
+ * keyword heuristic below can't reach them.
+ *
+ * The heuristic reads `parse`/`format`/`fmt` out of the label, which works only
+ * while a tool is named after its job. These four aren't, and the fallback for an
+ * unreadable label is `full` — a heading that reads "parse + format" over builds
+ * that ship no formatter at all, or none but a formatter. So each one is stated
+ * instead:
+ *
+ * - `dprint` and `malva` are the SAME kind of artifact and must land in the same
+ *   bucket: both are dprint plugins loaded over the one `@dprint/formatter` host,
+ *   and neither exposes a parser. dprint's covers TypeScript/JS, malva's CSS —
+ *   each a slice of what tsv's format-only build does, so pair both against
+ *   `tsv_format_wasm` and read the gap as scope before engine.
+ * - `swc` and rsvelte's addon back parse rows and ship no formatter. Both are far
+ *   wider than what the rows measure — swc's `.node` is an entire compiler
+ *   (transforms, minifier, bundler) and rsvelte's carries the compiler plus
+ *   svelte2tsx, HMR diffing and a resolver — so `parser` is the least-wrong
+ *   heading rather than a claim of scope match. The notes beside the table say so.
+ *
+ * `biome` is deliberately NOT here, though its js-api exposes no parser either: the
+ * bucket sizes what an ARTIFACT ships, and Biome's wasm build really is the whole
+ * toolchain (parser, formatter, linter) whether or not this page calls all of it.
+ * A dprint plugin is a formatter that happens to parse internally — the opposite
+ * shape, and the reason it can't ride the same fallback.
+ */
+const SIZE_CAPABILITY_BY_LABEL: Record<string, SizeCapability> = {
+  "dprint (wasm)": "formatter",
+  "malva (wasm)": "formatter",
+  "swc (napi)": "parser",
+  "rsvelte compiler (napi)": "parser",
+};
+
+/**
+ * Buckets a binary-size label by capability so each build lands next to its
+ * closest competitor: `parser` (tsv's parse-only build, `oxc-parser`),
+ * `formatter` (tsv's format-only build, `oxfmt`), else `full` (the flagship
+ * parse+format builds, `biome`, and the combined `oxc-parser + oxfmt` entry).
+ *
+ * A label naming neither job is looked up in `SIZE_CAPABILITY_BY_LABEL` first —
+ * the keyword read below can only answer for tools named after what they do.
+ */
+export const categorize_size_capability = (label: string): SizeCapability => {
+  const stated = SIZE_CAPABILITY_BY_LABEL[label];
+  if (stated) return stated;
+  const has_parse = label.includes("parse");
+  const has_format = label.includes("format") || label.includes("fmt");
+  // a build that does both is a full toolchain (e.g. the combined oxc-parser + oxfmt entry)
+  if (has_parse && has_format) return "full";
+  if (has_parse) return "parser"; // tsv parse (ffi), tsv_parse_wasm, oxc-parser
+  if (has_format) return "formatter"; // tsv format, oxfmt
+  // Reaching here must be a DECISION, not a name the heuristic couldn't read:
+  // every label that lands in `full` this way ships both operations (biome's whole
+  // toolchain included). Anything else belongs in the table above.
+  return "full"; // tsv (napi/ffi), tsv_wasm, biome (wasm)
+};
+
+export interface SizeDisplayEntry extends BinarySize {
+  bar_fraction: number;
+  category: ImplementationCategory;
+  // a grayed-out, inert placeholder for a build that doesn't exist (e.g. oxfmt's
+  // absent wasm build) — no bar, no size, just the label held in its slot. Absent
+  // on real, measured entries.
+  disabled?: boolean;
+}
+
+export interface SizeCapabilityGroup {
+  capability: SizeCapability;
+  heading: string;
+  // sorted smallest-first, so the leading entry is the default ratio anchor (1.0x)
+  entries: Array<SizeDisplayEntry>;
+}
+
+const SIZE_CAPABILITY_ORDER: ReadonlyArray<{
+  capability: SizeCapability;
+  heading: string;
+}> = [
+  { capability: "full", heading: "Full toolchain (parse + format)" },
+  { capability: "formatter", heading: "Formatter" },
+  { capability: "parser", heading: "Parser" },
+];
+
+/** Display label for the synthesized combined oxc full-toolchain build. */
+export const OXC_FULL_LABEL = "oxc-parser + oxfmt (napi)";
+
+/** Display label for oxfmt's absent wasm build placeholder — see `derive_size_groups`. */
+export const OXFMT_WASM_LABEL = "oxfmt (wasm)";
+
+/**
+ * Synthesizes oxc's full-toolchain native build by summing its separately-shipped
+ * parser (`oxc-parser (napi)`) and formatter (`oxfmt (napi)`) packages — together
+ * they're the closest equivalent to tsv's single parse+format build, so the entry
+ * stands beside `tsv (napi)` in the full-toolchain group. Returns `undefined` when
+ * either half is missing (older baselines), and sums gzip only when both carry it.
+ */
+const synthesize_oxc_full = (
+  sizes: Array<BinarySize>,
+): BinarySize | undefined => {
+  const parser = sizes.find((s) => s.label === "oxc-parser (napi)");
+  const formatter = sizes.find((s) => s.label === "oxfmt (napi)");
+  if (!parser || !formatter) return undefined;
+  return {
+    label: OXC_FULL_LABEL,
+    bytes: parser.bytes + formatter.bytes,
+    kind: "native",
+    gzip_bytes:
+      parser.gzip_bytes != null && formatter.gzip_bytes != null
+        ? parser.gzip_bytes + formatter.gzip_bytes
+        : null,
+  };
+};
+
+/** The rsvelte-fmt binary on its own — the label the tsv harness emits. */
+export const RSVELTE_LABEL = "rsvelte-fmt (binary)";
+
+/** Display label for the rsvelte-fmt + oxfmt install — see `synthesize_rsvelte_install`. */
+export const RSVELTE_INSTALL_LABEL = "rsvelte-fmt + oxfmt (binary)";
+
+/**
+ * Synthesizes what installing rsvelte-fmt to format a project actually costs, by
+ * summing its own binary with the `oxfmt` it declares as a peer dependency.
+ *
+ * Both figures are shown because which one is honest depends on how you invoke
+ * it, and the difference is verifiable: pointed at a **single `.svelte` file** (or
+ * stdin) rsvelte-fmt needs no oxfmt at all — it formats the embedded
+ * `<script>` and `<style>` through its own linked-in oxc engines, byte-identically
+ * whether or not oxfmt is reachable. But pointed at a **directory** — how a
+ * formatter is actually run over a project, and what the CLI benchmark times — it
+ * delegates the non-`.svelte` files to oxfmt and exits non-zero without it, even
+ * when that directory holds nothing but `.svelte`. So the bare binary is the
+ * single-file/editor figure and the sum is the project figure.
+ *
+ * Returns `undefined` when either half is missing (an older baseline predating the
+ * rsvelte row), and sums gzip only when both carry it — same posture as
+ * `synthesize_oxc_full`.
+ */
+const synthesize_rsvelte_install = (
+  sizes: Array<BinarySize>,
+): BinarySize | undefined => {
+  const rsvelte = sizes.find((s) => s.label === RSVELTE_LABEL);
+  const formatter = sizes.find((s) => s.label === "oxfmt (napi)");
+  if (!rsvelte || !formatter) return undefined;
+  return {
+    label: RSVELTE_INSTALL_LABEL,
+    bytes: rsvelte.bytes + formatter.bytes,
+    kind: "native",
+    gzip_bytes:
+      rsvelte.gzip_bytes != null && formatter.gzip_bytes != null
+        ? rsvelte.gzip_bytes + formatter.gzip_bytes
+        : null,
+  };
+};
+
+/**
+ * Groups the binary sizes by capability (full / formatter / parser), each group
+ * mixing wasm and native builds sorted smallest-first. Bars scale to the group's
+ * largest build; the `vs` ratio anchors on the group's single smallest build, so
+ * exactly one entry reads 1.0x and every other is a multiple of it — whichever tool
+ * that is. (It is not always tsv: yuku-parser's parse-only builds undercut tsv's,
+ * which carry Svelte and CSS parsers besides.) A combined `oxc-parser + oxfmt` entry is
+ * synthesized into the full-toolchain group, since oxc ships parse and format apart.
+ * oxfmt has no wasm build, so the formatter group gets a disabled `oxfmt (wasm)`
+ * placeholder slotted just above its real `oxfmt (napi)` entry, holding the slot
+ * rather than omitting it. The formatter group likewise carries both rsvelte-fmt
+ * figures — the bare binary and the `+ oxfmt` install it needs to format a
+ * project (see `synthesize_rsvelte_install`).
+ */
+export const derive_size_groups = (
+  sizes: Array<BinarySize>,
+): Array<SizeCapabilityGroup> => {
+  const oxc_full = synthesize_oxc_full(sizes);
+  const rsvelte_install = synthesize_rsvelte_install(sizes);
+  const all_sizes = [...sizes, oxc_full, rsvelte_install].filter(
+    (s) => s != null,
+  );
+  const groups: Array<SizeCapabilityGroup> = [];
+  for (const { capability, heading } of SIZE_CAPABILITY_ORDER) {
+    const items = all_sizes.filter(
+      (s) => categorize_size_capability(s.label) === capability,
+    );
+    if (items.length === 0) continue;
+    const sorted = items.toSorted((a, b) => a.bytes - b.bytes);
+    const max = Math.max(0, ...items.map((s) => s.bytes));
+    // `sorted` is ascending, so the smallest build leads the group — its single
+    // default ratio anchor (1.0x), one baseline whether or not the group mixes wasm
+    // and native (rather than the confusing pair a per-kind anchor produced). The
+    // shared component reads every ratio from that leading row.
+    const entries: Array<SizeDisplayEntry> = sorted.map((s) => ({
+      ...s,
+      bar_fraction: max > 0 ? s.bytes / max : 0,
+      category: categorize_size(s.label),
+    }));
+    if (
+      capability === "formatter" &&
+      !entries.some((e) => e.label === OXFMT_WASM_LABEL)
+    ) {
+      const native_index = entries.findIndex((e) => e.label === "oxfmt (napi)");
+      const placeholder: SizeDisplayEntry = {
+        label: OXFMT_WASM_LABEL,
+        bytes: 0,
+        kind: "wasm",
+        gzip_bytes: null,
+        bar_fraction: 0,
+        category: categorize_size(OXFMT_WASM_LABEL),
+        disabled: true,
+      };
+      entries.splice(
+        native_index === -1 ? entries.length : native_index,
+        0,
+        placeholder,
+      );
+    }
+    groups.push({ capability, heading, entries });
+  }
+  return groups;
+};
+
+// Cross-runtime combined report (the bench composer's `report.json`, `kind: 'combined'`)
+
+export type BenchmarkRuntime = "deno" | "node" | "bun";
+
+export interface CrossRuntimeRow {
+  group: string;
+  name: string;
+  ops_per_second: Partial<Record<BenchmarkRuntime, number>>;
+  mean_ns: Partial<Record<BenchmarkRuntime, number>>;
+  files_iterated: Partial<Record<BenchmarkRuntime, number | null>>;
+}
+
+export interface CrossRuntimeReport {
+  version: number;
+  kind: "combined";
+  generated: string;
+  runtimes: Array<BenchmarkRuntime>;
+  // The sibling reports came from different commits/versions — ratios are
+  // unreliable until every runtime is re-run. Present from combined
+  // `version` 6 on.
+  mixed_vintage?: boolean;
+  // The sibling reports were produced on different hardware — ratios are not
+  // comparable. Present from combined `version` 7 on.
+  mixed_machine?: boolean;
+  // Which ROWS lost their implementation to a load failure on which runtime,
+  // folded from the siblings' own `unavailable` lists. Present from combined
+  // `version` 8 on (as `impls`, carrying the bench's init-line labels, which
+  // matched no row name and so never joined; `rows` from `version` 9); `[]` when
+  // every sibling loaded everything, and absent on older reports — which is "not
+  // recorded", not a claim that nothing was missing.
+  //
+  // This is what tells the table's two kinds of gap apart. A row with no number
+  // for a runtime renders the same either way, but it means one of: that runtime
+  // couldn't load the impl behind it (recorded here), or that sibling's report
+  // simply has no such row — an older run predating it, which mixed vintages make
+  // likely, and which `partial_rows` below names outright.
+  unavailable_by_runtime?: Array<RuntimeUnavailable>;
+  // The other kind of gap: rows one sibling MEASURED that another doesn't carry at
+  // all, with no load failure recorded on that side to explain it — a stale
+  // sibling rather than a machine shortfall. `[]` when every row is present
+  // everywhere it should be. A runtime whose sibling predates `unavailable`
+  // contributes nothing (with nothing recorded, an absent row can't be told from
+  // an unloadable impl). Present from combined `version` 10 on; not rendered, kept
+  // for parity.
+  partial_rows?: Array<PartialRow>;
+  // Per-runtime deltas smaller than the combined measurement noise (cv) of the two
+  // means they divide — the cells that are NOT runtime effects, despite this
+  // report's subject being exactly those deltas. `[]` when every delta exceeds its
+  // noise. Unlike every other field here it qualifies a number the report already
+  // prints rather than adding one. Present from combined `version` 11 on; not
+  // rendered, kept for parity.
+  within_noise?: Array<WithinNoiseCell>;
+  // The conformance report's vintage beside the perf siblings'. The composer does
+  // not fold `report.conformance.node.json` (a coverage report, not a timing
+  // sibling), but this site publishes it from the same directory, and
+  // `mixed_vintage` above cannot see it — `stale` is that flag's perf/conformance
+  // analog: the conformance commit differs from some perf sibling's. `null` when
+  // the composer found no conformance report. Present from combined `version` 13
+  // on; rendered as the parse-conformance section's banner.
+  conformance_vintage?: ConformanceVintage | null;
+  sources: Array<{
+    runtime: BenchmarkRuntime;
+    timestamp: string;
+    git_commit: string | null;
+    tsv: string | null;
+    // The producing box's machine block; present from combined `version` 7 on.
+    machine?: Machine | null;
+    // That sibling's own load failures, with reasons; `null` when the sibling
+    // predates the field. `unavailable_by_runtime` above is the folded view.
+    unavailable?: Array<UnavailableImpl> | null;
+  }>;
+  rows: Array<CrossRuntimeRow>;
+}
+
+/** The conformance report's provenance (see `CrossRuntimeReport.conformance_vintage`). */
+export interface ConformanceVintage {
+  git_commit: string | null;
+  timestamp: string;
+  tsv: string | null;
+  // The conformance commit differs from some perf sibling's.
+  stale: boolean;
+}
+
+/**
+ * One runtime's load failures, named by the ROWS they cost (`bun` → `biome-wasm`,
+ * `oxc-parser-wasm`) — the identity the tables are keyed by, so a lookup can match.
+ */
+export interface RuntimeUnavailable {
+  runtime: BenchmarkRuntime;
+  rows: Array<string>;
+}
+
+/**
+ * One row a sibling measured and the runtimes in `missing` don't carry, with no
+ * load failure recorded there to explain it (see `CrossRuntimeReport.partial_rows`).
+ */
+export interface PartialRow {
+  group: string;
+  name: string;
+  missing: Array<BenchmarkRuntime>;
+}
+
+/**
+ * One per-runtime cell whose delta is inside the two measurements' combined
+ * variation (see `CrossRuntimeReport.within_noise`). `delta` and `noise` are
+ * fractions, not percentages.
+ */
+export interface WithinNoiseCell {
+  group: string;
+  name: string;
+  runtime: BenchmarkRuntime;
+  delta: number;
+  noise: number;
+}
+
+/**
+ * The rows each runtime couldn't measure, in the site's column order, for the
+ * disclosure above the tables. Empty when nothing was recorded — including on a
+ * report predating the field, where absence is silence rather than an all-clear.
+ */
+export const derive_unavailable_by_runtime = (
+  report: CrossRuntimeReport,
+): Array<RuntimeUnavailable> => {
+  const by_runtime = new Map(
+    (report.unavailable_by_runtime ?? []).map((entry) => [
+      entry.runtime,
+      entry,
+    ]),
+  );
+  return order_cross_runtime_runtimes(report.runtimes)
+    .map((runtime) => by_runtime.get(runtime))
+    .filter(
+      (entry): entry is RuntimeUnavailable =>
+        entry != null && entry.rows.length > 0,
+    );
+};
+
+/**
+ * Did `runtime` record `name` as a load failure? The table renders an absent
+ * number the same either way, so this is what lets a cell say WHICH gap it is —
+ * a binding that couldn't load, or a row that runtime's report never carried.
+ */
+export const is_impl_unavailable = (
+  report: CrossRuntimeReport,
+  runtime: BenchmarkRuntime,
+  name: string,
+): boolean =>
+  (report.unavailable_by_runtime ?? []).some(
+    (entry) => entry.runtime === runtime && entry.rows.includes(name),
+  );
+
+export interface CrossRuntimeDisplayRow {
+  name: string;
+  category: ImplementationCategory;
+  ops_per_second: Partial<Record<BenchmarkRuntime, number>>;
+  // ratio of each runtime vs the base (first present) runtime; `> 1` = faster
+  ratio_vs_base: Partial<Record<BenchmarkRuntime, number>>;
+  // The per-runtime timed file counts, set ONLY when they disagree — each
+  // runtime times the files its own impls passed preflight on, so unequal
+  // counts mean part of this row's ratio is file-set composition, not runtime
+  // (the composer's `⚠ files a/b/c` annotation in tsv's report.md). `null`
+  // when every present runtime timed the same count — the healthy, common case.
+  files_iterated_mismatch: Partial<
+    Record<BenchmarkRuntime, number | null>
+  > | null;
+}
+
+export interface CrossRuntimeGroup {
+  group: string;
+  operation: string;
+  language: string;
+  rows: Array<CrossRuntimeDisplayRow>;
+}
+
+// The combined report stores runtimes deno-first (matching the bench's
+// `report.md`); the site presents them node-first (the flagship N-API runtime),
+// then deno, then bun.
+const CROSS_RUNTIME_DISPLAY_ORDER: Array<BenchmarkRuntime> = [
+  "node",
+  "deno",
+  "bun",
+];
+
+/**
+ * The report's runtimes in the site's display order — node (the flagship, the
+ * ratio anchor) first, then deno, then bun. Shared by `derive_cross_runtime_groups`
+ * and the table headers so the anchor can't drift between them.
+ */
+export const order_cross_runtime_runtimes = (
+  runtimes: Array<BenchmarkRuntime>,
+): Array<BenchmarkRuntime> =>
+  CROSS_RUNTIME_DISPLAY_ORDER.filter((r) => runtimes.includes(r));
+
+/** One runtime's own version string (`node 24.14.1`), for the cross-runtime section. */
+export interface RuntimeVersion {
+  runtime: BenchmarkRuntime;
+  version: string;
+}
+
+/**
+ * The per-runtime version strings from a cross-runtime report, in the site's
+ * display order (node first). Drops any runtime whose source carries no machine
+ * block (reports predating combined `version` 7). The cross-runtime section
+ * renders these so the three-runtime tables disclose which node/deno/bun version
+ * each column was measured under; the environment panel above stays scoped to the
+ * flagship Node baseline. The shared hardware identity (CPU/OS/arch) isn't
+ * repeated here — it lives in the environment panel, and a per-runtime hardware
+ * mismatch is the report's `mixed_machine` flag's concern.
+ */
+export const derive_runtime_versions = (
+  report: CrossRuntimeReport,
+): Array<RuntimeVersion> => {
+  const by_runtime = new Map(
+    report.sources.map((source) => [source.runtime, source]),
+  );
+  const result: Array<RuntimeVersion> = [];
+  for (const runtime of order_cross_runtime_runtimes(report.runtimes)) {
+    const version = by_runtime.get(runtime)?.machine?.runtime_version;
+    if (version) result.push({ runtime, version });
+  }
+  return result;
+};
+
+/**
+ * Groups the combined report's rows by benchmark group, in the same display
+ * order as `derive_benchmark_groups` (format before parse, then svelte /
+ * typescript / css). The ratio base is the first runtime in display order
+ * (node when present — the flagship N-API path), regardless of the report's
+ * own deno-first storage order.
+ */
+export const derive_cross_runtime_groups = (
+  report: CrossRuntimeReport,
+): Array<CrossRuntimeGroup> => {
+  const runtimes = order_cross_runtime_runtimes(report.runtimes);
+  const base = runtimes[0];
+  const grouped: Map<string, Array<CrossRuntimeDisplayRow>> = new Map();
+  for (const row of report.rows) {
+    let rows = grouped.get(row.group);
+    if (!rows) {
+      rows = [];
+      grouped.set(row.group, rows);
+    }
+    const base_ops = base ? row.ops_per_second[base] : undefined;
+    const ratio_vs_base: Partial<Record<BenchmarkRuntime, number>> = {};
+    for (const runtime of runtimes) {
+      const ops = row.ops_per_second[runtime];
+      if (ops != null && base_ops != null && base_ops > 0) {
+        ratio_vs_base[runtime] = ops / base_ops;
+      }
+    }
+    const iterated_counts = runtimes
+      .map((runtime) => row.files_iterated[runtime])
+      .filter((n): n is number => n != null);
+    rows.push({
+      name: row.name,
+      category: categorize_name(row.name),
+      ops_per_second: row.ops_per_second,
+      ratio_vs_base,
+      files_iterated_mismatch:
+        new Set(iterated_counts).size > 1 ? row.files_iterated : null,
+    });
+  }
+
+  const result: Array<CrossRuntimeGroup> = [];
+  for (const [group, rows] of grouped) {
+    const [operation, language] = group.split("/");
+    result.push({ group, operation: operation!, language: language!, rows });
+  }
+  result.sort(
+    (a, b) =>
+      (OPERATION_ORDER[a.operation] ?? 9) -
+        (OPERATION_ORDER[b.operation] ?? 9) ||
+      (LANGUAGE_ORDER[a.language] ?? 9) - (LANGUAGE_ORDER[b.language] ?? 9),
+  );
+  return result;
 };
 
 // Formatting utilities
 
 export interface FormattedUnit {
-	value: string;
-	unit: string;
+  value: string;
+  unit: string;
 }
 
 export const format_ns = (ns: number): FormattedUnit => {
-	if (ns < 1_000) return {value: `${Math.round(ns)}`, unit: 'ns'};
-	if (ns < 1_000_000)
-		return {
-			value: (ns / 1_000).toFixed(ns < 10_000 ? 2 : ns < 100_000 ? 1 : 0),
-			unit: 'µs',
-		};
-	const ms = Math.round(ns / 1_000_000);
-	return {value: ms.toLocaleString('en-US'), unit: 'ms'};
+  if (ns < 1_000) return { value: `${Math.round(ns)}`, unit: "ns" };
+  if (ns < 1_000_000)
+    return {
+      value: (ns / 1_000).toFixed(ns < 10_000 ? 2 : ns < 100_000 ? 1 : 0),
+      unit: "µs",
+    };
+  const ms = Math.round(ns / 1_000_000);
+  return { value: ms.toLocaleString("en-US"), unit: "ms" };
 };
 
 export const format_bytes = (bytes: number): FormattedUnit => {
-	if (bytes < 1_024) return {value: `${bytes}`, unit: 'B'};
-	if (bytes < 1_048_576) return {value: (bytes / 1_024).toFixed(0), unit: 'KB'};
-	return {value: (bytes / 1_048_576).toFixed(1), unit: 'MB'};
+  if (bytes < 1_024) return { value: `${bytes}`, unit: "B" };
+  if (bytes < 1_048_576)
+    return { value: (bytes / 1_024).toFixed(0), unit: "KB" };
+  return { value: (bytes / 1_048_576).toFixed(1), unit: "MB" };
 };
 
 /**
- * Formats per-implementation corpus coverage as `processed/total`, or
- * `undefined` when either value is missing (older baselines without coverage).
+ * Formats a corpus source's file count as a per-language breakdown
+ * (`124 typescript, 15 svelte, 31 css`), largest language first and dropping
+ * zero-count languages. Falls back to the plain `N files` total when the report
+ * predates the per-language split (or lists no recognized language).
  */
-export const format_coverage = (
-	processed: number | null | undefined,
-	total: number | null | undefined,
-): string | undefined => {
-	if (processed == null || total == null) return undefined;
-	return `${processed}/${total}`;
+export const format_corpus_source_files = (source: CorpusSource): string => {
+  const total = `${source.files.toLocaleString("en-US")} files`;
+  if (!source.by_language) return total;
+  const parts = Object.entries(source.by_language)
+    .filter((entry): entry is [string, number] => (entry[1] ?? 0) > 0)
+    .sort((a, b) => b[1] - a[1])
+    .map(([language, count]) => `${count.toLocaleString("en-US")} ${language}`);
+  return parts.length > 0 ? parts.join(", ") : total;
+};
+
+// Corpus source repos (site-owned path → URL mapping)
+
+export interface CorpusRepo {
+  // public repo URL the entry links to
+  url: string;
+  // `org/name`, derived from the URL — the linkified display label
+  label: string;
+}
+
+/**
+ * Maps a corpus source's on-disk path to its public repo URL. The bench records
+ * only local paths (`../zzz/src`), so the site owns this mapping — the links then
+ * survive an `update-benchmarks` refresh without touching the copied JSON. Keyed by
+ * the repo's directory prefix, each ending in a slash so siblings like `../fuz_css/`
+ * and `../fuz_code/`, and `../svelte/` vs `../svelte.dev/`, stay distinct. A source
+ * matching no prefix — the derived `svelte_styles` CSS cache, which isn't a single
+ * repo — is dropped from the repos list rather than shown unlinked.
+ */
+const CORPUS_REPO_URL_BY_PREFIX: ReadonlyArray<readonly [string, string]> = [
+  ["../zzz/", "https://github.com/fuzdev/zzz"],
+  ["../fuz_app/", "https://github.com/fuzdev/fuz_app"],
+  ["../fuz_blog/", "https://github.com/fuzdev/fuz_blog"],
+  ["../fuz_code/", "https://github.com/fuzdev/fuz_code"],
+  ["../fuz_css/", "https://github.com/fuzdev/fuz_css"],
+  ["../fuz_docs/", "https://github.com/fuzdev/fuz_docs"],
+  ["../fuz_gitops/", "https://github.com/fuzdev/fuz_gitops"],
+  ["../fuz_mastodon/", "https://github.com/fuzdev/fuz_mastodon"],
+  ["../fuz_template/", "https://github.com/fuzdev/fuz_template"],
+  ["../fuz_ui/", "https://github.com/fuzdev/fuz_ui"],
+  ["../fuz_util/", "https://github.com/fuzdev/fuz_util"],
+  ["../mdz/", "https://github.com/fuzdev/mdz"],
+  ["../gro/", "https://github.com/fuzdev/gro"],
+  ["../svelte-docinfo/", "https://github.com/fuzdev/svelte-docinfo"],
+  ["../tsv.fuz.dev/", "https://github.com/fuzdev/tsv.fuz.dev"],
+  ["../ryanatkn.com/", "https://github.com/ryanatkn/ryanatkn.com"],
+  ["../webdevladder.net/", "https://github.com/ryanatkn/webdevladder.net"],
+  ["../kit/", "https://github.com/sveltejs/kit"],
+  ["../svelte.dev/", "https://github.com/sveltejs/svelte.dev"],
+  ["../svelte/", "https://github.com/sveltejs/svelte"],
+];
+
+/** The repo URL for a corpus source path, or `undefined` when it maps to no repo. */
+const corpus_repo_url = (path: string): string | undefined =>
+  CORPUS_REPO_URL_BY_PREFIX.find(([prefix]) => path.startsWith(prefix))?.[1];
+
+/** `org/name` from a `https://github.com/org/name` URL — the linkified label. */
+const corpus_repo_label = (url: string): string =>
+  new URL(url).pathname.slice(1);
+
+/**
+ * The distinct source repos behind a report's corpus, one entry per URL in
+ * first-seen order (the author's ecosystem leads, the upstream framework repos
+ * trail, matching the source order). Sources sharing a repo (svelte.dev's several
+ * packages) collapse to one entry; sources with no mapped repo (the `svelte_styles`
+ * CSS cache) are dropped. URLs come from the site-owned `CORPUS_REPO_URL_BY_PREFIX`,
+ * not the report, so the links survive a refresh.
+ */
+export const derive_corpus_repos = (
+  sources: Array<CorpusSource> | undefined,
+): Array<CorpusRepo> => {
+  const by_url: Map<string, CorpusRepo> = new Map();
+  for (const source of sources ?? []) {
+    // Prefer the report's git-detected repo; fall back to the legacy prefix
+    // map for reports predating `version` 8 (which lack `source.repo`).
+    const url = source.repo?.url ?? corpus_repo_url(source.path);
+    if (!url || by_url.has(url)) continue;
+    by_url.set(url, {
+      url,
+      label: source.repo?.slug ?? corpus_repo_label(url),
+    });
+  }
+  return [...by_url.values()];
 };
 
 /**
@@ -277,60 +1350,291 @@ export const format_coverage = (
  * `undefined` when the baseline lacks it (older runs, or no `gzip` available
  * on the generating machine).
  */
-export const format_gzip_size = (gzip_bytes: number | null | undefined): string | undefined => {
-	if (gzip_bytes == null) return undefined;
-	const {value, unit} = format_bytes(gzip_bytes);
-	return `${value} ${unit} gz`;
+export const format_gzip_size = (
+  gzip_bytes: number | null | undefined,
+): string | undefined => {
+  if (gzip_bytes == null) return undefined;
+  const { value, unit } = format_bytes(gzip_bytes);
+  return `${value} ${unit} gz`;
 };
 
 /** Matches the bench report generator's ratio formatting so the site and report.md agree digit for digit. */
 export const format_speedup = (ratio: number): string =>
-	ratio >= 10 ? `${ratio.toFixed(1)}x` : `${ratio.toFixed(2)}x`;
+  ratio >= 10 ? `${ratio.toFixed(1)}x` : `${ratio.toFixed(2)}x`;
+
+/**
+ * Loose ratio formatting for prose, which reads better with fewer digits than a
+ * table column (`1.7x`, `26x`) — always paired with a `~` in the copy. Renders
+ * `—` for a missing ratio rather than throwing mid-sentence; the benchmark tests
+ * assert every ratio the page quotes actually resolves.
+ */
+export const format_ratio_approx = (ratio: number | undefined): string =>
+  ratio === undefined
+    ? "—"
+    : ratio >= 10
+      ? `${Math.round(ratio)}x`
+      : `${ratio.toFixed(1)}x`;
+
+/**
+ * An inclusive ratio range for prose (`3–9x`), FLOORED at both ends so a
+ * "3–9x less memory" claim never overstates either bound.
+ */
+export const format_ratio_range = (min: number, max: number): string =>
+  `${Math.floor(min)}–${Math.floor(max)}x`;
+
+/**
+ * A bracketing ratio range for prose (`4–5x`) — the min FLOORED and the max
+ * CEILED, so the stated integer range always contains the true range: the low
+ * end ("at least") is never overstated, and only the soft "up to" end rounds
+ * outward. Always paired with a `~` in the copy. Use `format_ratio_range` when
+ * neither bound may overstate; this one reads better when flooring both would
+ * collapse the range.
+ */
+export const format_ratio_range_approx = (min: number, max: number): string =>
+  `${Math.floor(min)}–${Math.ceil(max)}x`;
+
+/**
+ * How many times faster `faster` is than `slower` within one `operation/language`
+ * group, by mean time — the ratio the prose summaries quote.
+ *
+ * @returns the ratio, or `undefined` when either entry is absent from the report
+ */
+export const benchmark_speedup = (
+  baseline: BenchmarkBaseline,
+  group: string,
+  slower: string,
+  faster: string,
+): number | undefined => {
+  const find = (name: string) =>
+    baseline.entries.find((e) => e.group === group && e.name === name);
+  // a coverage-only report carries null timings, so both sides must be real
+  const a = find(slower)?.mean_ns;
+  const b = find(faster)?.mean_ns;
+  if (a == null || !b) return undefined;
+  return a / b;
+};
+
+/**
+ * Signed speedup: entries at or above the anchor read as a plain multiple
+ * (`2.50x`), while slower entries show the reciprocal negated (`0.15x` → `-6.67x`)
+ * so "how many times slower" is directly legible instead of a fraction the reader
+ * has to invert. The minus is a convention for "times slower", not a literal
+ * negative rate. Used for the format/parse speed bars, where entries span widely
+ * on both sides of the anchor; the near-parity cross-runtime table and the
+ * bigger-is-worse size ratios stay on the plain fractional `format_speedup`.
+ */
+export const format_speedup_signed = (ratio: number): string => {
+  const magnitude = ratio >= 1 ? ratio : 1 / ratio;
+  const digits = magnitude >= 10 ? 1 : 2;
+  return `${ratio < 1 ? "-" : ""}${magnitude.toFixed(digits)}x`;
+};
 
 /** Hyphenated tool names that should preserve their hyphens in display labels. */
-const HYPHENATED_NAMES = ['acorn-typescript', 'oxc-parser'];
+const HYPHENATED_NAMES = [
+  "acorn-typescript",
+  "oxc-parser",
+  "rsvelte-fmt",
+  "yuku-parser",
+];
+
+/**
+ * Display labels for the raw benchmark entry names in the main (Node) tables,
+ * annotating each with the runtime **and** binding it runs under — the native
+ * builds load the N-API addon under Node, so they read `(node napi)` to
+ * distinguish them from the Deno FFI numbers the cross-runtime table surfaces
+ * (`tsv (deno ffi)`); the third-party wasm builds are marked `(wasm)`. Mirrors
+ * the parenthesized suffixes the binary-size section's labels already carry.
+ * tsv's own wasm entries keep their `tsv_wasm` package-name style, as in the size
+ * groups, so they aren't listed here. The already-parenthesized size labels
+ * aren't keys, so they fall through to the generic formatting below unchanged.
+ * The cross-runtime table neutralizes the `(node napi)` suffix per row (its
+ * columns span runtimes) via `format_cross_runtime_label`.
+ */
+const LABEL_OVERRIDES: Record<string, string> = {
+  tsv: "tsv (node napi)",
+  "tsv-json": "tsv json (node napi)",
+  // `no-locs` (not `no-locations`) — the full word eats too much column width.
+  "tsv-json-no-locations": "tsv json no-locs (node napi)",
+  // the one tsv_wasm entry listed here: the generic formatting below would
+  // break the `no-locs` hyphen its native sibling deliberately keeps
+  "tsv_wasm-json-no-locations": "tsv_wasm json no-locs",
+  "tsv-internal": "tsv internal (node napi)",
+  "oxc-parser": "oxc-parser (node napi)",
+  oxfmt: "oxfmt (node napi)",
+  "biome-wasm": "biome (wasm)",
+  "dprint-wasm": "dprint (wasm)",
+  "malva-wasm": "malva (wasm)",
+  "oxc-parser-wasm": "oxc-parser (wasm)",
+  "yuku-parser": "yuku-parser (node napi)",
+  "yuku-parser-wasm": "yuku-parser (wasm)",
+  swc: "swc (node napi)",
+  // both rsvelte parse rows are the same N-API addon, distinguished by the option
+  // the second one passes — kept in the label, since that option IS the row
+  "rsvelte-parse": "rsvelte-parse (node napi)",
+  "rsvelte-parse-skip-expr-loc": "rsvelte-parse skip-expr-loc (node napi)",
+  // `postcss` needs no entry: it's plain JS with no binding to name, like `prettier`
+};
 
 export const format_label = (name: string): string => {
-	for (const tool of HYPHENATED_NAMES) {
-		if (name.startsWith(tool)) {
-			return tool + name.slice(tool.length).replaceAll('-', ' ');
-		}
-	}
-	return name.replaceAll('-', ' ');
+  const override = LABEL_OVERRIDES[name];
+  if (override) return override;
+  for (const tool of HYPHENATED_NAMES) {
+    if (name.startsWith(tool)) {
+      return tool + name.slice(tool.length).replaceAll("-", " ");
+    }
+  }
+  return name.replaceAll("-", " ");
 };
 
+/**
+ * The label for a cross-runtime row. Each row spans node/deno/bun columns, and a
+ * native build's binding is runtime-specific (N-API on node & bun, C-FFI on
+ * deno), so the row can't pin one binding — neutralize `format_label`'s
+ * node-centric `(node napi)` suffix to `(native)`. The per-runtime binding is
+ * disclosed once in the table caption instead (see `BenchmarksCrossRuntime`).
+ */
+export const format_cross_runtime_label = (name: string): string =>
+  format_label(name).replace(" (node napi)", " (native)");
+
 /** Returns a CSS background color variable for a category. */
 export const category_color = (category: ImplementationCategory): string => {
-	switch (category) {
-		case 'canonical':
-			return 'var(--color_h_40)';
-		case 'tsv_native':
-			return 'var(--color_g_40)';
-		case 'tsv_native_json':
-			return 'var(--color_e_40)';
-		case 'tsv_wasm':
-			return 'var(--color_d_40)';
-		case 'tsv_wasm_json':
-			return 'var(--color_f_40)';
-		case 'biome':
-			return 'var(--color_a_40)';
-		case 'oxc':
-			return 'var(--color_i_40)';
-	}
-};
-
-/** Returns a CSS color variable for a size ratio (inverted — bigger is worse). */
-export const size_ratio_color = (ratio: number): string => {
-	if (ratio < 2) return 'var(--color_b_50)'; // green — similar
-	if (ratio < 5) return 'var(--color_e_50)'; // yellow — notably larger
-	return 'var(--color_c_50)'; // red — much larger
+  switch (category) {
+    case "canonical":
+      return "var(--color_h_40)";
+    case "tsv_native":
+      return "var(--color_g_40)";
+    case "tsv_native_json":
+      return "var(--color_e_40)";
+    case "tsv_wasm":
+      return "var(--color_d_40)";
+    case "tsv_wasm_json":
+      return "var(--color_f_40)";
+    case "biome":
+      return "var(--color_a_40)";
+    case "dprint":
+      return "var(--color_b_40)";
+    case "oxc":
+      return "var(--color_i_40)";
+    case "rsvelte":
+      return "var(--color_c_40)";
+    case "yuku":
+      return "var(--color_j_40)";
+    // The palette has ten hues and the categories above spend all ten, so these
+    // two reuse a hue at a lighter shade. The pairing is chosen so a collision
+    // can't show up in a speed group: `swc` and `postcss` are parse-only, while
+    // `biome` and `dprint` are format-only, and placeholder rows mirror only
+    // within an operation. They DO meet in the binary-size table, which lists
+    // both operations' tools — hence the distinct shade rather than a bare reuse.
+    // A future biome/dprint parse row (or an swc formatter) would break that, and
+    // would need a real hue freed up.
+    case "swc":
+      return "var(--color_a_50)"; // biome's hue, lighter
+    case "postcss":
+      return "var(--color_b_50)"; // dprint's hue, lighter
+  }
+};
+
+/**
+ * Returns a CSS color variable for a size ratio (inverted — bigger is worse).
+ * Green is reserved for builds smaller than the baseline (ratio < 1, only reachable
+ * once a hover re-baselines onto a larger build); any build at or above the baseline
+ * reads yellow at the floor, ramping through orange to red as it grows.
+ */
+const size_ratio_color = (ratio: number): string => {
+  if (ratio < 1) return "var(--color_b_50)"; // green — smaller than baseline
+  if (ratio < 3) return "var(--color_e_50)"; // yellow — larger
+  if (ratio < 10) return "var(--color_h_50)"; // orange — much larger
+  return "var(--color_c_50)"; // red — enormous
 };
 
 /** Returns a CSS color variable for the speedup ratio. */
-export const speedup_color = (ratio: number): string => {
-	if (ratio < 0.5) return 'var(--color_c_50)'; // red — much slower
-	if (ratio < 1) return 'var(--color_h_50)'; // orange — slower
-	if (ratio < 2) return 'var(--color_e_50)'; // yellow — modest
-	if (ratio < 5) return 'var(--color_b_50)'; // green — fast
-	return 'var(--color_j_50)'; // teal — exceptional
+const speedup_color = (ratio: number): string => {
+  if (ratio < 0.5) return "var(--color_c_50)"; // red — much slower
+  if (ratio < 1) return "var(--color_h_50)"; // orange — slower
+  if (ratio < 2) return "var(--color_e_50)"; // yellow — modest
+  if (ratio < 5) return "var(--color_b_50)"; // green — fast
+  return "var(--color_j_50)"; // teal — exceptional
+};
+
+/**
+ * Cross-runtime ratio cell background: a stable fuz_css red (`color_c`) / green
+ * (`color_b`) whose ALPHA varies with distance from parity. Fully transparent at ratio
+ * `1.0` (parity recedes), ramping to `0.3` alpha at ratio `0.8` and below (red) or `1.2`
+ * and above (green). The hue stays constant — only opacity moves — so it reads
+ * consistently in light and dark themes while the cell's text keeps the default color.
+ * Deliberately its own scale — NOT the shared `speedup_color` — because cross-runtime
+ * deltas cluster tightly near 1.0 and this must not bleed into the other displays.
+ */
+export const cross_runtime_ratio_background = (ratio: number): string => {
+  // 0 alpha at ratio 1.0, up to 0.3 at ratio ≤ 0.8 (red) or ≥ 1.2 (green)
+  const alpha = Math.min(1, Math.abs(ratio - 1) / 0.2) * 0.3;
+  const color = ratio < 1 ? "var(--color_c_50)" : "var(--color_b_50)";
+  return `color-mix(in srgb, ${color} ${(alpha * 100).toFixed(1)}%, transparent)`;
 };
+
+// Interactive baseline (hover-to-rebaseline)
+
+/**
+ * Which way a group's ratio runs, so re-anchoring on hover stays consistent. A
+ * `speed` group (format/parse) reads its anchor as a reference speed — faster
+ * entries are positive multiples, slower ones negative (`format_speedup_signed` /
+ * `speedup_color`). A `size` group reads its anchor as a reference size — bigger
+ * builds are multiples ≥ 1 (`format_size_ratio` / `size_ratio_color`). The two
+ * ratios are reciprocals, which is exactly why one direction flag suffices.
+ */
+export type BaselineDirection = "speed" | "size";
+
+/** An entry's ratio against its group's anchor, in the group's direction. */
+export const compute_baseline_ratio = (
+  direction: BaselineDirection,
+  entry_raw: number,
+  anchor_raw: number,
+): number =>
+  direction === "speed" ? anchor_raw / entry_raw : entry_raw / anchor_raw;
+
+/** Plain size ratio (`2.3x`) — its own formatter since sizes never take the signed treatment. */
+const format_size_ratio = (ratio: number): string => `${ratio.toFixed(1)}x`;
+
+/** Formats a baseline ratio for display in the given direction. */
+export const format_baseline_ratio = (
+  direction: BaselineDirection,
+  ratio: number,
+): string =>
+  direction === "speed"
+    ? format_speedup_signed(ratio)
+    : format_size_ratio(ratio);
+
+/** Color for a baseline ratio in the given direction. */
+export const baseline_ratio_color = (
+  direction: BaselineDirection,
+  ratio: number,
+): string =>
+  direction === "speed" ? speedup_color(ratio) : size_ratio_color(ratio);
+
+/**
+ * A normalized row for `BenchmarksBaselineGroup` — the shared hover-to-rebaseline
+ * column behind the format, parse, and binary-size groups. `raw` is the number the
+ * ratio derives from (sweep mean ns for speed, bytes for size); `value` is the
+ * row's displayed measurement (the whole-sweep mean — total time over the group's
+ * iterated corpus — for speed, bytes for size). Flattening the group-specific
+ * display entries to this one shape lets a single component own the anchor state
+ * for all three sections.
+ */
+export interface BaselineRow {
+  // stable identity for `#each` and anchor matching (the entry name / size label)
+  key: string;
+  // raw name/label; `BenchmarksBar` formats it for display
+  label: string;
+  category: ImplementationCategory;
+  bar_fraction: number;
+  value: FormattedUnit;
+  // the number the ratio derives from — mean ns (speed) or bytes (size)
+  raw: number;
+  annotation: string | undefined;
+  // grayed-out, inert placeholder — never an anchor, no hover highlight
+  disabled: boolean;
+  // inert because the tool was measured for COVERAGE but deliberately never
+  // timed, not because it sat the group out — the bar reads `not timed` instead
+  // of `n/a` so the two aren't conflated. See `BenchmarkDisplayEntry.coverage_only`.
+  coverage_only?: boolean;
+}
diff --git a/src/routes/docs/benchmarks/benchmarks.json b/src/routes/docs/benchmarks/benchmarks.json
index bf56417..640ac6e 100644
--- a/src/routes/docs/benchmarks/benchmarks.json
+++ b/src/routes/docs/benchmarks/benchmarks.json
@@ -1,685 +1,1396 @@
 {
-	"version": 4,
-	"timestamp": "2026-06-12T09:22:00.588Z",
-	"git_commit": "98918f9",
-	"corpus": {
-		"svelte": 1240,
-		"typescript": 4025,
-		"css": 193
-	},
-	"versions": {
-		"tsv": "0.1.0",
-		"svelte": "5.56.1",
-		"acorn": "8.16.0",
-		"acorn_ts": "1.0.10",
-		"prettier": "3.8.3",
-		"prettier_svelte": "3.5.2",
-		"oxc_parser": "0.134.0",
-		"oxfmt": "0.53.0",
-		"biome": "2.4.16"
-	},
-	"binary_sizes": [
-		{
-			"label": "tsv (native)",
-			"bytes": 3861760,
-			"kind": "native",
-			"gzip_bytes": 1622771
-		},
-		{
-			"label": "tsv_format_wasm",
-			"bytes": 2196292,
-			"kind": "wasm",
-			"gzip_bytes": 715422
-		},
-		{
-			"label": "tsv_parse_wasm",
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+    {
+      "name": "tsv-json",
+      "group": "parse/css",
+      "mean_ns": 18000639.09920635,
+      "p50_ns": 17947730,
+      "p75_ns": 18354698.5,
+      "p90_ns": 18603804.6,
+      "p95_ns": 20372409.7,
+      "p99_ns": 20942744.74,
+      "min_ns": 17216489,
+      "max_ns": 21328942,
+      "std_dev_ns": 339320.3265924146,
+      "cv": 0.018850459959911938,
+      "ops_per_second": 55.553583097174034,
+      "sample_size": 252,
+      "files_processed": 49,
+      "files_total": 49,
+      "files_iterated": 49,
+      "runtime": "node"
+    },
+    {
+      "name": "tsv_wasm-json",
+      "group": "parse/css",
+      "mean_ns": 18764620.53508772,
+      "p50_ns": 18740547,
+      "p75_ns": 19102997,
+      "p90_ns": 20367969,
+      "p95_ns": 21207924,
+      "p99_ns": 25274176.8,
+      "min_ns": 18357108,
+      "max_ns": 26441810,
+      "std_dev_ns": 341734.9144390616,
+      "cv": 0.018211661344286496,
+      "ops_per_second": 53.29177843645242,
+      "sample_size": 228,
+      "files_processed": 49,
+      "files_total": 49,
+      "files_iterated": 49,
+      "runtime": "node"
+    },
+    {
+      "name": "tsv-internal",
+      "group": "parse/css",
+      "mean_ns": 3480814.634865568,
+      "p50_ns": 3475398,
+      "p75_ns": 3518308,
+      "p90_ns": 3578241,
+      "p95_ns": 3606003.7,
+      "p99_ns": 3650405.88,
+      "min_ns": 3453907,
+      "max_ns": 7457366,
+      "std_dev_ns": 18552.546116894897,
+      "cv": 0.00532994372382355,
+      "ops_per_second": 287.28907020313676,
+      "sample_size": 1153,
+      "files_processed": 49,
+      "files_total": 49,
+      "files_iterated": 49,
+      "runtime": "node"
+    },
+    {
+      "name": "tsv_wasm-internal",
+      "group": "parse/css",
+      "mean_ns": 4932686.724514564,
+      "p50_ns": 4930767,
+      "p75_ns": 4982384,
+      "p90_ns": 5034730.2,
+      "p95_ns": 5064031.2,
+      "p99_ns": 5114722,
+      "min_ns": 4863110,
+      "max_ns": 5776553,
+      "std_dev_ns": 26337.33784619051,
+      "cv": 0.005339349388498298,
+      "ops_per_second": 202.72927429795618,
+      "sample_size": 824,
+      "files_processed": 49,
+      "files_total": 49,
+      "files_iterated": 49,
+      "runtime": "node"
+    },
+    {
+      "name": "postcss",
+      "group": "parse/css",
+      "mean_ns": 9993276.322916666,
+      "p50_ns": 9919278.5,
+      "p75_ns": 10232884.25,
+      "p90_ns": 10493054.4,
+      "p95_ns": 10716796.85,
+      "p99_ns": 12003724.75,
+      "min_ns": 9684563,
+      "max_ns": 13097905,
+      "std_dev_ns": 288474.07124320604,
+      "cv": 0.028866816239402373,
+      "ops_per_second": 100.0672820090836,
+      "sample_size": 480,
+      "files_processed": 49,
+      "files_total": 49,
+      "files_iterated": 49,
+      "runtime": "node"
+    },
+    {
+      "name": "prettier",
+      "group": "format/css",
+      "mean_ns": 550984644.5714285,
+      "p50_ns": 551906474,
+      "p75_ns": 554866997,
+      "p90_ns": 571789881.4,
+      "p95_ns": 573570332.2,
+      "p99_ns": 574994692.84,
+      "min_ns": 546602608,
+      "max_ns": 575350783,
+      "std_dev_ns": 2812881.4613011964,
+      "cv": 0.0051051902970710465,
+      "ops_per_second": 1.814932611738805,
+      "sample_size": 7,
+      "files_processed": 49,
+      "files_total": 49,
+      "files_iterated": 49,
+      "runtime": "node"
+    },
+    {
+      "name": "tsv",
+      "group": "format/css",
+      "mean_ns": 7535043.544688027,
+      "p50_ns": 7516547,
+      "p75_ns": 7610273,
+      "p90_ns": 7717023,
+      "p95_ns": 7752229,
+      "p99_ns": 7829766.8,
+      "min_ns": 7446395,
+      "max_ns": 11034314,
+      "std_dev_ns": 65292.369883821186,
+      "cv": 0.008665161587533264,
+      "ops_per_second": 132.71323437871425,
+      "sample_size": 593,
+      "files_processed": 49,
+      "files_total": 49,
+      "files_iterated": 49,
+      "runtime": "node"
+    },
+    {
+      "name": "tsv_wasm",
+      "group": "format/css",
+      "mean_ns": 10393598.935010482,
+      "p50_ns": 10351143,
+      "p75_ns": 10515251,
+      "p90_ns": 10606301,
+      "p95_ns": 10657458,
+      "p99_ns": 10760711.2,
+      "min_ns": 10203516,
+      "max_ns": 13754626,
+      "std_dev_ns": 138930.7229569105,
+      "cv": 0.013366950545775547,
+      "ops_per_second": 96.21306404574976,
+      "sample_size": 477,
+      "files_processed": 49,
+      "files_total": 49,
+      "files_iterated": 49,
+      "runtime": "node"
+    },
+    {
+      "name": "oxfmt",
+      "group": "format/css",
+      "mean_ns": 17245523.40780142,
+      "p50_ns": 17194057,
+      "p75_ns": 17612011,
+      "p90_ns": 18022482.4,
+      "p95_ns": 18446463.599999998,
+      "p99_ns": 19372747.96,
+      "min_ns": 15697029,
+      "max_ns": 20242484,
+      "std_dev_ns": 525670.3489587697,
+      "cv": 0.030481553764901696,
+      "ops_per_second": 57.986062606115304,
+      "sample_size": 282,
+      "files_processed": 49,
+      "files_total": 49,
+      "files_iterated": 49,
+      "runtime": "node"
+    },
+    {
+      "name": "biome-wasm",
+      "group": "format/css",
+      "mean_ns": 188672058.92592594,
+      "p50_ns": 206897166,
+      "p75_ns": 227085643.5,
+      "p90_ns": 242915809,
+      "p95_ns": 245089172.5,
+      "p99_ns": 246104036.44,
+      "min_ns": 136369614,
+      "max_ns": 246385033,
+      "std_dev_ns": 45216463.3827949,
+      "cv": 0.23965638388749033,
+      "ops_per_second": 5.3002018724595965,
+      "sample_size": 27,
+      "files_processed": 49,
+      "files_total": 49,
+      "files_iterated": 49,
+      "runtime": "node"
+    },
+    {
+      "name": "malva-wasm",
+      "group": "format/css",
+      "mean_ns": 45764374.69444445,
+      "p50_ns": 45546510.5,
+      "p75_ns": 46275262.25,
+      "p90_ns": 46897246,
+      "p95_ns": 47169844.65,
+      "p99_ns": 47759296.3,
+      "min_ns": 45052474,
+      "max_ns": 48104397,
+      "std_dev_ns": 675910.6239076322,
+      "cv": 0.014769362160424846,
+      "ops_per_second": 21.851057873656355,
+      "sample_size": 108,
+      "files_processed": 49,
+      "files_total": 49,
+      "files_iterated": 49,
+      "runtime": "node"
+    },
+    {
+      "name": "rsvelte-fmt",
+      "group": "format/svelte",
+      "mean_ns": null,
+      "p50_ns": null,
+      "p75_ns": null,
+      "p90_ns": null,
+      "p95_ns": null,
+      "p99_ns": null,
+      "min_ns": null,
+      "max_ns": null,
+      "std_dev_ns": null,
+      "cv": null,
+      "ops_per_second": null,
+      "sample_size": null,
+      "files_processed": 773,
+      "files_total": 773,
+      "files_iterated": null,
+      "runtime": "node"
+    }
+  ],
+  "suppressed_noise": {},
+  "output_digest_ungraded": {},
+  "variant_parity": [],
+  "unavailable": []
 }
diff --git a/src/routes/docs/benchmarks/benchmarks.ts b/src/routes/docs/benchmarks/benchmarks.ts
index e457993..e15563e 100644
--- a/src/routes/docs/benchmarks/benchmarks.ts
+++ b/src/routes/docs/benchmarks/benchmarks.ts
@@ -1,5 +1,5 @@
-import type {BenchmarkBaseline} from './benchmark_data.ts';
+import type { BenchmarkBaseline } from "./benchmark_data.ts";
 
-import json from './benchmarks.json' with {type: 'json'};
+import json from "./benchmarks.json" with { type: "json" };
 
 export const benchmarks_json: BenchmarkBaseline = json as BenchmarkBaseline;
diff --git a/src/routes/docs/benchmarks/benchmarks_cli.ts b/src/routes/docs/benchmarks/benchmarks_cli.ts
new file mode 100644
index 0000000..b7abe08
--- /dev/null
+++ b/src/routes/docs/benchmarks/benchmarks_cli.ts
@@ -0,0 +1,229 @@
+// The independent end-to-end CLI benchmark — a fork of Oxc's official
+// `bench-formatter` that adds tsv (https://github.com/ryanatkn/oxc-bench-formatter,
+// forked from https://github.com/oxc-project/bench-formatter — `tsv` is the fork's
+// DEFAULT branch, so the bare fork URL already lands on it; upstream carries
+// neither tsv nor this analysis). Unlike the in-process, single-threaded numbers
+// elsewhere on this page, it measures the WHOLE CLI: process spawn, file
+// discovery, I/O, and each tool's default multi-file parallelism. tsv, oxfmt, and
+// biome parallelize across files while prettier is effectively serial, so the
+// wall-clock ratios scale with core count and are machine-dependent — the
+// parallelism-neutral view is CPU work (hyperfine `User` time). tsv runs only in
+// the JSX-free scenarios (it has no JSX/TSX parser); the Svelte scenario benches
+// it against rsvelte-fmt (`@rsvelte/fmt`), the other Rust Svelte-native formatter.
+// tsv is non-configurable, so in every scenario it appears in, the formatters it
+// is compared against are pinned to its fixed style — width 100, tabs, single
+// quotes, no trailing commas — and before timing anything the harness asserts that
+// every formatter reporting a file count reports the same one.
+//
+// The numbers come from `benchmarks_formatters.json`, generated from that
+// harness's README by `benchmarks_formatters.gen.json.ts`; only the prose below
+// is authored here. To refresh: run `pnpm run update-readme` in the harness, then
+// `gro gen` here.
+
+import { benchmarks_formatters_json } from "./benchmarks_formatters.ts";
+import type { FormatterScenario } from "./formatter_benchmark_data.ts";
+
+export interface CliFormatterResult {
+  /** Display label; `tsv` is the reference row every ratio is computed against. */
+  label: string;
+  /** hyperfine wall-clock mean, in milliseconds — what you experience typing the command. */
+  wall_ms: number;
+  /** hyperfine `User` time (total CPU across all threads), in ms — the parallelism-neutral view. */
+  cpu_ms: number;
+  /** Peak resident set size (RSS), in megabytes; `null` when the harness measured no memory. */
+  memory_mb: number | null;
+}
+
+export interface CliScenario {
+  key: string;
+  heading: string;
+  /** The harness's own one-line corpus label, rendered beside the heading. */
+  target: string;
+  /** One-line description of what makes the comparison fair. */
+  description: string;
+  /** Results ascending by wall-clock time, tsv-relative ratios computed by the component. */
+  results: Array<CliFormatterResult>;
+}
+
+export interface BenchmarksCliReport {
+  machine: string;
+  versions: Record<string, string>;
+  scenarios: Array<CliScenario>;
+}
+
+/**
+ * The prose framing for each scenario, keyed by its generated scenario id — the
+ * harness measures the numbers but doesn't explain them. Also fixes the page
+ * order, which is by narrative weight (the multi-file repo leads), not the order
+ * the harness runs them in. A scenario missing from here is dropped rather than
+ * rendered unexplained.
+ */
+/**
+ * The tsv-vs-rsvelte-fmt Svelte scenario's id. Absent from the generated data
+ * until the harness README is regenerated with it, so prose about it must be
+ * conditional on the scenario actually being present.
+ */
+export const CLI_SVELTE_KEY = "svelte-tsv-vs-rsvelte-fmt";
+
+/**
+ * The multi-file TypeScript repo scenario's id, in both spellings. The harness
+ * renamed it from "TypeScript-only (tsv-fair)" to "TypeScript-only (non-JSX
+ * subset)" — the name describes the corpus rather than the motive — and the
+ * generated data carries whichever the README was last regenerated with, so both
+ * are kept while that regeneration is pending. Once the data has the new id,
+ * delete the legacy entry and drop both from `CLI_OPTIONAL_SCENARIO_KEYS` — a
+ * test fails at exactly that point so the transitional pair can't outlive the
+ * migration.
+ */
+const CLI_TS_REPO_KEY_CURRENT = "typescript-only-non-jsx-subset";
+
+/**
+ * Exported only so a test can retire it. `benchmark_data.test.ts` fails the
+ * moment the generated data resolves to `CLI_TS_REPO_KEY_CURRENT`, which is what
+ * turns the deletion above from a comment nobody rereads into a gate.
+ */
+export const CLI_TS_REPO_KEY_LEGACY = "typescript-only-tsv-fair";
+
+/** Shared by both ids above; only ever one of them is present in the data. */
+const TS_REPO_COPY = {
+  heading: "TypeScript repo",
+  description:
+    "Every formatter scoped to the same file set and pinned to tsv’s fixed style, so they make the same break decisions over the same files; a preflight check aborts the scenario rather than publish a comparison the tools didn’t run on equal work.",
+};
+
+const SCENARIO_COPY: Record<
+  string,
+  Omit<CliScenario, "key" | "target" | "results">
+> = {
+  [CLI_TS_REPO_KEY_CURRENT]: TS_REPO_COPY,
+  [CLI_TS_REPO_KEY_LEGACY]: TS_REPO_COPY,
+  "large-single-file": {
+    heading: "Large single file",
+    description:
+      "With a single input every formatter is effectively single-threaded, so wall-clock is close to an engine comparison here.",
+  },
+  [CLI_SVELTE_KEY]: {
+    heading: "Svelte corpus",
+    description:
+      "The two Rust Svelte-native formatters head-to-head on a third-party .svelte corpus, with rsvelte-fmt configured to tsv’s fixed style (width 100, tabs, single quotes) so both do comparable line-break work.",
+  },
+};
+
+/**
+ * Display labels for the harness's hyperfine command names, which read better
+ * spaced out in a table. Names absent here are displayed as-is.
+ */
+export const CLI_LABELS: Record<string, string> = {
+  "prettier+oxc-parser": "prettier + oxc-parser",
+};
+
+const to_results = (scenario: FormatterScenario): Array<CliFormatterResult> =>
+  scenario.timings
+    .map((timing) => ({
+      label: CLI_LABELS[timing.name] ?? timing.name,
+      wall_ms: timing.mean_ms,
+      cpu_ms: timing.user_ms,
+      memory_mb:
+        scenario.memory.find((m) => m.name === timing.name)?.mean_mb ?? null,
+    }))
+    .sort((a, b) => a.wall_ms - b.wall_ms);
+
+/** The scenarios the page has prose for; every non-optional one must resolve to generated data. */
+export const CLI_SCENARIO_KEYS = Object.keys(SCENARIO_COPY);
+
+/**
+ * The copy entries allowed to be absent from the generated data — prose staged
+ * ahead of the harness README carrying the scenario, so this repo can land
+ * support for a new scenario before the harness's numbers are regenerated.
+ * Every other `SCENARIO_COPY` entry must resolve; the shape test enforces
+ * exactly that split.
+ */
+export const CLI_OPTIONAL_SCENARIO_KEYS: Array<string> = [
+  CLI_SVELTE_KEY,
+  // Exactly one of the two TypeScript-repo ids is in the data at a time, so each
+  // has to be allowed to be absent. Nothing is weakened by that: `CLI_TS_REPO_KEY`
+  // still has to resolve to whichever one is present, and the ratio tests below
+  // fail loudly if neither is.
+  CLI_TS_REPO_KEY_CURRENT,
+  CLI_TS_REPO_KEY_LEGACY,
+];
+
+const to_scenarios = (): Array<CliScenario> =>
+  Object.entries(SCENARIO_COPY).flatMap(([key, copy]) => {
+    const scenario = benchmarks_formatters_json.scenarios.find(
+      (s) => s.id === key,
+    );
+    return scenario
+      ? [
+          {
+            key,
+            ...copy,
+            target: scenario.target,
+            results: to_results(scenario),
+          },
+        ]
+      : [];
+  });
+
+export const benchmarks_cli: BenchmarksCliReport = {
+  machine: benchmarks_formatters_json.machine,
+  versions: benchmarks_formatters_json.versions,
+  scenarios: to_scenarios(),
+};
+
+/**
+ * The scenario id the page's prose calls "the TypeScript repo" — the multi-file,
+ * real-repo run. Resolved against the generated data rather than hardcoded, so
+ * the page's ratios keep working across the harness's rename in either direction.
+ */
+export const CLI_TS_REPO_KEY = benchmarks_formatters_json.scenarios.some(
+  (s) => s.id === CLI_TS_REPO_KEY_CURRENT,
+)
+  ? CLI_TS_REPO_KEY_CURRENT
+  : CLI_TS_REPO_KEY_LEGACY;
+
+/**
+ * How many times faster or lighter tsv is than `label` in one CLI scenario, by
+ * the given metric — the ratios the page's prose quotes.
+ *
+ * @returns the ratio, or `undefined` when the scenario, the formatter, or either
+ * side's measurement is absent
+ */
+export const cli_speedup_vs_tsv = (
+  scenario_key: string,
+  label: string,
+  metric: keyof Omit<CliFormatterResult, "label">,
+): number | undefined => {
+  const results = benchmarks_cli.scenarios.find(
+    (s) => s.key === scenario_key,
+  )?.results;
+  const tsv = results?.find((r) => r.label === "tsv")?.[metric];
+  const other = results?.find((r) => r.label === label)?.[metric];
+  if (tsv == null || other == null || !tsv) return undefined;
+  return other / tsv;
+};
+
+/**
+ * The span of "times less memory than tsv" across the non-tsv rows, over one
+ * scenario or all of them — the range claims the page's prose quotes. An
+ * optional `labels` list narrows the span to just those formatters, so a
+ * sentence naming specific tools quotes a range measured over exactly them.
+ *
+ * @returns the low and high ratio, or `undefined` when nothing was measured
+ */
+export const cli_memory_ratio_range = (
+  scenario_key?: string,
+  labels?: Array<string>,
+): { min: number; max: number } | undefined => {
+  const scenarios = benchmarks_cli.scenarios.filter(
+    (s) => !scenario_key || s.key === scenario_key,
+  );
+  const ratios = scenarios.flatMap((scenario) =>
+    scenario.results
+      .filter((r) => r.label !== "tsv" && (!labels || labels.includes(r.label)))
+      .map((r) => cli_speedup_vs_tsv(scenario.key, r.label, "memory_mb"))
+      .filter((ratio) => ratio !== undefined),
+  );
+  if (ratios.length === 0) return undefined;
+  return { min: Math.min(...ratios), max: Math.max(...ratios) };
+};
diff --git a/src/routes/docs/benchmarks/benchmarks_conformance.json b/src/routes/docs/benchmarks/benchmarks_conformance.json
new file mode 100644
index 0000000..eae267e
--- /dev/null
+++ b/src/routes/docs/benchmarks/benchmarks_conformance.json
@@ -0,0 +1,1337 @@
+{
+  "version": 13,
+  "runtime": "node",
+  "corpus_kind": "conformance",
+  "timestamp": "2026-08-24T13:00:43.410Z",
+  "git_commit": "5950c4ad",
+  "machine": {
+    "cpu_model": "AMD Ryzen 5 PRO 7530U with Radeon Graphics",
+    "os": "linux",
+    "arch": "x86_64",
+    "runtime_version": "24.14.1"
+  },
+  "corpus": {
+    "svelte": 4571,
+    "typescript": 52321,
+    "css": 22642
+  },
+  "corpus_sources": [
+    {
+      "path": "../prettier-plugin-svelte/test",
+      "files": 318,
+      "by_language": {
+        "svelte": 318,
+        "typescript": 0,
+        "css": 0
+      },
+      "repo": {
+        "url": "https://github.com/sveltejs/prettier-plugin-svelte",
+        "slug": "sveltejs/prettier-plugin-svelte",
+        "commit": "7809486a9716faa2234c8a45d88b601034de52d8",
+        "subpath": "test"
+      }
+    },
+    {
+      "path": "../prettier/tests/format/typescript",
+      "files": 793,
+      "by_language": {
+        "svelte": 0,
+        "typescript": 793,
+        "css": 0
+      },
+      "repo": {
+        "url": "https://github.com/prettier/prettier",
+        "slug": "prettier/prettier",
+        "commit": "1dcd0b05d026356cce5bf538c6d425955b29903b",
+        "subpath": "tests/format/typescript"
+      }
+    },
+    {
+      "path": "../prettier/tests/format/js",
+      "files": 1103,
+      "by_language": {
+        "svelte": 0,
+        "typescript": 1103,
+        "css": 0
+      },
+      "repo": {
+        "url": "https://github.com/prettier/prettier",
+        "slug": "prettier/prettier",
+        "commit": "1dcd0b05d026356cce5bf538c6d425955b29903b",
+        "subpath": "tests/format/js"
+      }
+    },
+    {
+      "path": "../prettier/tests/format/css",
+      "files": 228,
+      "by_language": {
+        "svelte": 0,
+        "typescript": 78,
+        "css": 150
+      },
+      "repo": {
+        "url": "https://github.com/prettier/prettier",
+        "slug": "prettier/prettier",
+        "commit": "1dcd0b05d026356cce5bf538c6d425955b29903b",
+        "subpath": "tests/format/css"
+      }
+    },
+    {
+      "path": "../prettier/tests/format/html",
+      "files": 84,
+      "by_language": {
+        "svelte": 84,
+        "typescript": 0,
+        "css": 0
+      },
+      "repo": {
+        "url": "https://github.com/prettier/prettier",
+        "slug": "prettier/prettier",
+        "commit": "1dcd0b05d026356cce5bf538c6d425955b29903b",
+        "subpath": "tests/format/html"
+      }
+    },
+    {
+      "path": "../svelte/packages/svelte/tests",
+      "files": 4488,
+      "by_language": {
+        "svelte": 4169,
+        "typescript": 137,
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diff --git a/src/routes/docs/benchmarks/benchmarks_conformance.ts b/src/routes/docs/benchmarks/benchmarks_conformance.ts
new file mode 100644
index 0000000..d22cb37
--- /dev/null
+++ b/src/routes/docs/benchmarks/benchmarks_conformance.ts
@@ -0,0 +1,6 @@
+import type { BenchmarkBaseline } from "./benchmark_data.ts";
+
+import json from "./benchmarks_conformance.json" with { type: "json" };
+
+export const benchmarks_conformance_json: BenchmarkBaseline =
+  json as BenchmarkBaseline;
diff --git a/src/routes/docs/benchmarks/benchmarks_cross_runtime.json b/src/routes/docs/benchmarks/benchmarks_cross_runtime.json
new file mode 100644
index 0000000..8281ae0
--- /dev/null
+++ b/src/routes/docs/benchmarks/benchmarks_cross_runtime.json
@@ -0,0 +1,971 @@
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diff --git a/src/routes/docs/benchmarks/benchmarks_cross_runtime.ts b/src/routes/docs/benchmarks/benchmarks_cross_runtime.ts
new file mode 100644
index 0000000..ad9621d
--- /dev/null
+++ b/src/routes/docs/benchmarks/benchmarks_cross_runtime.ts
@@ -0,0 +1,6 @@
+import type { CrossRuntimeReport } from "./benchmark_data.ts";
+
+import json from "./benchmarks_cross_runtime.json" with { type: "json" };
+
+export const benchmarks_cross_runtime_json: CrossRuntimeReport =
+  json as CrossRuntimeReport;
diff --git a/src/routes/docs/benchmarks/benchmarks_formatters.gen.json.ts b/src/routes/docs/benchmarks/benchmarks_formatters.gen.json.ts
new file mode 100644
index 0000000..28150cb
--- /dev/null
+++ b/src/routes/docs/benchmarks/benchmarks_formatters.gen.json.ts
@@ -0,0 +1,42 @@
+import type { Gen } from "@fuzdev/gro/gen.ts";
+import { readFile } from "node:fs/promises";
+import { resolve } from "node:path";
+
+import { parse_formatter_benchmarks } from "./formatter_benchmark_data.ts";
+
+// The formatter comparison harness lives in a sibling checkout and publishes its
+// results only as prose — see `formatter_benchmark_data.ts`.
+const README_PATH = "../oxc-bench-formatter/README.md";
+
+/**
+ * Generate `benchmarks_formatters.json` from the sibling formatter-benchmark
+ * harness's README.
+ *
+ * A MISSING sibling checkout is the one tolerated case — it's an optional repo,
+ * so generation is skipped, the committed JSON stands, and `gro gen --check`
+ * passes on a machine (or CI) that has only this repo. A README that IS present
+ * but doesn't parse fails the task instead: the alternative is quietly publishing
+ * stale or scenario-stripped numbers.
+ */
+export const gen: Gen = {
+  generate: async ({ log }) => {
+    const path = resolve(README_PATH);
+
+    let readme;
+    try {
+      readme = await readFile(path, "utf8");
+    } catch (error) {
+      // only "it isn't there" is benign; an unreadable file is a real problem
+      if ((error as NodeJS.ErrnoException).code !== "ENOENT") throw error;
+      log.info(`skipping formatter benchmarks, no readme at ${path}`);
+      return null;
+    }
+
+    const benchmarks = parse_formatter_benchmarks(readme);
+    log.info(
+      `parsed ${benchmarks.scenarios.length} tsv scenario(s) from ${path}`,
+    );
+    return JSON.stringify(benchmarks);
+  },
+  dependencies: { files: [resolve(README_PATH)] },
+};
diff --git a/src/routes/docs/benchmarks/benchmarks_formatters.json b/src/routes/docs/benchmarks/benchmarks_formatters.json
new file mode 100644
index 0000000..5ce1ef8
--- /dev/null
+++ b/src/routes/docs/benchmarks/benchmarks_formatters.json
@@ -0,0 +1,262 @@
+{
+  "machine": "AMD Ryzen 5 PRO 7530U with Radeon Graphics · 12 threads · linux x64",
+  "versions": {
+    "prettier": "3.9.5",
+    "biome": "2.5.4",
+    "oxfmt": "0.60.0",
+    "rsvelte-fmt": "0.7.4",
+    "tsv": "0.1.0"
+  },
+  "scenarios": [
+    {
+      "id": "large-single-file",
+      "name": "Large Single File",
+      "target": "TypeScript compiler parser.ts (~540KB)",
+      "warmup_runs": 2,
+      "benchmark_runs": 5,
+      "preflight": [
+        {
+          "name": "prettier",
+          "rejected": 0,
+          "unavailable": false,
+          "crashed": false
+        },
+        {
+          "name": "prettier+oxc-parser",
+          "rejected": 0,
+          "unavailable": false,
+          "crashed": false
+        },
+        {
+          "name": "biome",
+          "rejected": 0,
+          "unavailable": false,
+          "crashed": false
+        },
+        {
+          "name": "oxfmt",
+          "rejected": 0,
+          "unavailable": false,
+          "crashed": false
+        },
+        { "name": "tsv", "rejected": 0, "unavailable": false, "crashed": false }
+      ],
+      "timings": [
+        {
+          "name": "prettier",
+          "mean_ms": 1605,
+          "stddev_ms": 22,
+          "user_ms": 1541,
+          "system_ms": 858,
+          "min_ms": 1572,
+          "max_ms": 1623
+        },
+        {
+          "name": "prettier+oxc-parser",
+          "mean_ms": 985,
+          "stddev_ms": 4.8,
+          "user_ms": 889,
+          "system_ms": 462.3,
+          "min_ms": 977.6,
+          "max_ms": 990
+        },
+        {
+          "name": "biome",
+          "mean_ms": 113.9,
+          "stddev_ms": 1.7,
+          "user_ms": 87.1,
+          "system_ms": 34.6,
+          "min_ms": 112.2,
+          "max_ms": 116.7
+        },
+        {
+          "name": "oxfmt",
+          "mean_ms": 195.8,
+          "stddev_ms": 9.4,
+          "user_ms": 354.4,
+          "system_ms": 201.4,
+          "min_ms": 188.1,
+          "max_ms": 211.9
+        },
+        {
+          "name": "tsv",
+          "mean_ms": 23.8,
+          "stddev_ms": 0.2,
+          "user_ms": 14.9,
+          "system_ms": 8.8,
+          "min_ms": 23.6,
+          "max_ms": 24.1
+        }
+      ],
+      "baseline": "tsv",
+      "speedups": [
+        { "name": "biome", "ratio": 4.79, "ratio_stddev": 0.08 },
+        { "name": "oxfmt", "ratio": 8.24, "ratio_stddev": 0.4 },
+        { "name": "prettier+oxc-parser", "ratio": 41.44, "ratio_stddev": 0.43 },
+        { "name": "prettier", "ratio": 67.55, "ratio_stddev": 1.13 }
+      ],
+      "memory": [
+        {
+          "name": "prettier",
+          "mean_mb": 305.9,
+          "min_mb": 293.4,
+          "max_mb": 313.3,
+          "ratio": 12.34,
+          "ratio_stddev": 0.44
+        },
+        {
+          "name": "prettier+oxc-parser",
+          "mean_mb": 196.2,
+          "min_mb": 194.6,
+          "max_mb": 197.9,
+          "ratio": 7.91,
+          "ratio_stddev": 0.19
+        },
+        {
+          "name": "biome",
+          "mean_mb": 101,
+          "min_mb": 98,
+          "max_mb": 104,
+          "ratio": 4.07,
+          "ratio_stddev": 0.13
+        },
+        {
+          "name": "oxfmt",
+          "mean_mb": 118.6,
+          "min_mb": 118.6,
+          "max_mb": 118.7,
+          "ratio": 4.79,
+          "ratio_stddev": 0.11
+        },
+        { "name": "tsv", "mean_mb": 24.8, "min_mb": 24.2, "max_mb": 25.6 }
+      ]
+    },
+    {
+      "id": "typescript-only-tsv-fair",
+      "name": "TypeScript-only (tsv-fair)",
+      "target": "Outline repository (non-JSX JS/TS subset)",
+      "warmup_runs": 2,
+      "benchmark_runs": 5,
+      "preflight": [
+        {
+          "name": "prettier",
+          "rejected": 0,
+          "unavailable": false,
+          "crashed": false
+        },
+        {
+          "name": "prettier+oxc-parser",
+          "rejected": 0,
+          "unavailable": false,
+          "crashed": false
+        },
+        {
+          "name": "biome",
+          "rejected": 0,
+          "unavailable": false,
+          "crashed": false
+        },
+        {
+          "name": "oxfmt",
+          "rejected": 0,
+          "unavailable": false,
+          "crashed": false
+        },
+        { "name": "tsv", "rejected": 0, "unavailable": false, "crashed": false }
+      ],
+      "timings": [
+        {
+          "name": "prettier",
+          "mean_ms": 8250,
+          "stddev_ms": 118,
+          "user_ms": 13524,
+          "system_ms": 882,
+          "min_ms": 8121,
+          "max_ms": 8382
+        },
+        {
+          "name": "prettier+oxc-parser",
+          "mean_ms": 6740,
+          "stddev_ms": 24,
+          "user_ms": 8533,
+          "system_ms": 560,
+          "min_ms": 6710,
+          "max_ms": 6768
+        },
+        {
+          "name": "biome",
+          "mean_ms": 361.6,
+          "stddev_ms": 1.4,
+          "user_ms": 2510.6,
+          "system_ms": 350.3,
+          "min_ms": 359.7,
+          "max_ms": 363.1
+        },
+        {
+          "name": "oxfmt",
+          "mean_ms": 278.2,
+          "stddev_ms": 12.2,
+          "user_ms": 867.6,
+          "system_ms": 433.7,
+          "min_ms": 260.9,
+          "max_ms": 293
+        },
+        {
+          "name": "tsv",
+          "mean_ms": 65.4,
+          "stddev_ms": 2.9,
+          "user_ms": 439.2,
+          "system_ms": 137.6,
+          "min_ms": 63.2,
+          "max_ms": 70.2
+        }
+      ],
+      "baseline": "tsv",
+      "speedups": [
+        { "name": "oxfmt", "ratio": 4.25, "ratio_stddev": 0.26 },
+        { "name": "biome", "ratio": 5.53, "ratio_stddev": 0.25 },
+        {
+          "name": "prettier+oxc-parser",
+          "ratio": 102.99,
+          "ratio_stddev": 4.59
+        },
+        { "name": "prettier", "ratio": 126.06, "ratio_stddev": 5.88 }
+      ],
+      "memory": [
+        {
+          "name": "prettier",
+          "mean_mb": 472.9,
+          "min_mb": 385.2,
+          "max_mb": 529.1,
+          "ratio": 10.01,
+          "ratio_stddev": 1.38
+        },
+        {
+          "name": "prettier+oxc-parser",
+          "mean_mb": 302.5,
+          "min_mb": 300.6,
+          "max_mb": 304.4,
+          "ratio": 6.4,
+          "ratio_stddev": 0.37
+        },
+        {
+          "name": "biome",
+          "mean_mb": 211.6,
+          "min_mb": 207.1,
+          "max_mb": 213.7,
+          "ratio": 4.48,
+          "ratio_stddev": 0.26
+        },
+        {
+          "name": "oxfmt",
+          "mean_mb": 229.5,
+          "min_mb": 215.2,
+          "max_mb": 243.2,
+          "ratio": 4.86,
+          "ratio_stddev": 0.37
+        },
+        { "name": "tsv", "mean_mb": 47.3, "min_mb": 44.2, "max_mb": 50.2 }
+      ]
+    }
+  ]
+}
diff --git a/src/routes/docs/benchmarks/benchmarks_formatters.ts b/src/routes/docs/benchmarks/benchmarks_formatters.ts
new file mode 100644
index 0000000..fcc31fb
--- /dev/null
+++ b/src/routes/docs/benchmarks/benchmarks_formatters.ts
@@ -0,0 +1,6 @@
+import type { FormatterBenchmarks } from "./formatter_benchmark_data.ts";
+
+import json from "./benchmarks_formatters.json" with { type: "json" };
+
+export const benchmarks_formatters_json: FormatterBenchmarks =
+  json as FormatterBenchmarks;
diff --git a/src/routes/docs/benchmarks/formatter_benchmark_data.ts b/src/routes/docs/benchmarks/formatter_benchmark_data.ts
new file mode 100644
index 0000000..4f9abd3
--- /dev/null
+++ b/src/routes/docs/benchmarks/formatter_benchmark_data.ts
@@ -0,0 +1,298 @@
+// Types and parser for the formatter comparison benchmark — Prettier, Biome,
+// Oxfmt, rsvelte-fmt, and tsv on shared corpora. Unlike the tsv bench reports, that harness
+// emits no JSON: its numbers exist only as the hyperfine console dump embedded
+// in its README between the `BENCHMARK_RESULTS_START`/`END` markers, plus a
+// `## Versions` list and a `_Measured on: …_` machine line. This module turns
+// that text into data; `benchmarks_formatters.gen.json.ts` writes it out.
+
+/** A single formatter's timing in one scenario. All durations in milliseconds. */
+export interface FormatterTiming {
+  name: string;
+  mean_ms: number;
+  stddev_ms: number;
+  min_ms: number;
+  max_ms: number;
+  user_ms: number;
+  system_ms: number;
+}
+
+/** A single formatter's peak-RSS measurement in one scenario. */
+export interface FormatterMemory {
+  name: string;
+  mean_mb: number;
+  min_mb: number;
+  max_mb: number;
+  /** Ratio to the scenario's lowest-memory formatter; absent on that baseline row. */
+  ratio?: number;
+  ratio_stddev?: number;
+}
+
+/** How a scenario's fastest formatter compares to one of the others. */
+export interface FormatterSpeedup {
+  name: string;
+  ratio: number;
+  ratio_stddev: number;
+}
+
+/**
+ * A formatter's parse-check result over the scenario's corpus. The harness runs
+ * this before timing so a tool that rejects files isn't credited for skipping
+ * them.
+ */
+export interface FormatterPreflight {
+  name: string;
+  /** Files the formatter refused to parse. */
+  rejected: number;
+  /** The formatter's binary never launched, so its timing row is meaningless. */
+  unavailable: boolean;
+  /** The check pass crashed partway (exit ≥ 128), so its coverage is unknown. */
+  crashed: boolean;
+}
+
+/** One benchmark scenario — a corpus benched across every formatter that supports it. */
+export interface FormatterScenario {
+  /** Slug derived from `name`, e.g. `large-single-file`. */
+  id: string;
+  name: string;
+  /** The corpus, as the harness describes it. */
+  target: string;
+  warmup_runs: number;
+  benchmark_runs: number;
+  preflight: Array<FormatterPreflight>;
+  timings: Array<FormatterTiming>;
+  /** The fastest formatter and its margin over each other one. */
+  baseline: string;
+  speedups: Array<FormatterSpeedup>;
+  memory: Array<FormatterMemory>;
+}
+
+/**
+ * The parsed formatter comparison. Only scenarios tsv participates in are
+ * included — it has no JSX/TSX parser, so the harness runs it on the JSX-free
+ * corpora only and the other scenarios have no tsv row to compare against.
+ */
+export interface FormatterBenchmarks {
+  /**
+   * The machine the numbers came from. The ratios move with it — Biome, Oxfmt,
+   * and tsv scale across cores while Prettier is effectively serial.
+   */
+  machine: string;
+  /** Formatter name to version string, e.g. `prettier` to `3.9.1`. */
+  versions: Record<string, string>;
+  scenarios: Array<FormatterScenario>;
+}
+
+const to_slug = (value: string): string =>
+  value
+    .toLowerCase()
+    .replace(/[^a-z0-9]+/g, "-")
+    .replace(/^-|-$/g, "");
+
+/** Milliseconds from a hyperfine duration and its unit, e.g. `1.597` + `s`. */
+const to_ms = (value: string, unit: string): number => {
+  const n = Number(value);
+  if (unit === "s") return n * 1000;
+  if (unit === "ms") return n;
+  if (unit === "µs" || unit === "us") return n / 1000;
+  throw new Error(`unknown duration unit: ${unit}`);
+};
+
+// The console dump the harness writes into its README.
+const RESULTS_START = "<!-- BENCHMARK_RESULTS_START -->";
+const RESULTS_END = "<!-- BENCHMARK_RESULTS_END -->";
+
+const SCENARIO_RE = /^=+\nBenchmarking (.+)\n=+$/gm;
+const TARGET_RE = /^Target: (.+)$/m;
+const RUNS_RE = /^- (\d+) warmup runs?, (\d+) benchmark runs?$/m;
+const TIMING_RE =
+  /^Benchmark \d+: (.+)\n\s*Time \(mean ± σ\):\s*([\d.]+) (\S+) ±\s*([\d.]+) (\S+)\s*\[User: ([\d.]+) (\S+), System: ([\d.]+) (\S+)\]\n\s*Range \(min … max\):\s*([\d.]+) (\S+) …\s*([\d.]+) (\S+)/gm;
+const SPEEDUP_BASELINE_RE = /^Summary\n\s*(.+?) ran$/m;
+const SPEEDUP_RE = /^\s*([\d.]+) ± ([\d.]+) times faster than (.+)$/gm;
+const MEMORY_RE =
+  /^\s*(\S+): ([\d.]+) MB \(min: ([\d.]+) MB, max: ([\d.]+) MB(?:, ([\d.]+) ± ([\d.]+) times more than \S+)?\)$/gm;
+const PREFLIGHT_HEADING = "Preflight (per-formatter parse check):";
+const PREFLIGHT_RE = /^\s{2}(\S+): (clean|unavailable|\d+ rejected|CRASHED)/gm;
+const VERSIONS_RE = /^## Versions\n\n((?:- \*\*.+\*\*: .+\n)+)/m;
+const VERSION_RE = /^- \*\*(.+?)\*\*: (.+)$/gm;
+const MACHINE_RE = /^_Measured on: (.+?)(?: — |_$)/m;
+
+/** The text of one section of a scenario block, between two of its headings. */
+const slice_section = (
+  block: string,
+  start: string,
+  ...ends: Array<string>
+): string => {
+  const from = block.indexOf(start);
+  if (from === -1) return "";
+  const rest = block.slice(from + start.length);
+  const to = ends.reduce((lowest, end) => {
+    const i = rest.indexOf(end);
+    return i === -1 || i >= lowest ? lowest : i;
+  }, rest.length);
+  return rest.slice(0, to);
+};
+
+const parse_timings = (block: string): Array<FormatterTiming> =>
+  [...block.matchAll(TIMING_RE)].map((m) => ({
+    name: m[1]!.trim(),
+    mean_ms: to_ms(m[2]!, m[3]!),
+    stddev_ms: to_ms(m[4]!, m[5]!),
+    user_ms: to_ms(m[6]!, m[7]!),
+    system_ms: to_ms(m[8]!, m[9]!),
+    min_ms: to_ms(m[10]!, m[11]!),
+    max_ms: to_ms(m[12]!, m[13]!),
+  }));
+
+const parse_preflight = (block: string): Array<FormatterPreflight> =>
+  [
+    ...slice_section(block, PREFLIGHT_HEADING, "Benchmark 1:").matchAll(
+      PREFLIGHT_RE,
+    ),
+  ].map((m) => ({
+    name: m[1]!,
+    rejected: Number.parseInt(m[2]!, 10) || 0,
+    unavailable: m[2] === "unavailable",
+    crashed: m[2] === "CRASHED",
+  }));
+
+const parse_memory = (block: string): Array<FormatterMemory> =>
+  [
+    ...slice_section(block, "Memory Usage:", " benchmark complete!").matchAll(
+      MEMORY_RE,
+    ),
+  ].map((m) => ({
+    name: m[1]!,
+    mean_mb: Number(m[2]),
+    min_mb: Number(m[3]),
+    max_mb: Number(m[4]),
+    ...(m[5] === undefined
+      ? null
+      : { ratio: Number(m[5]), ratio_stddev: Number(m[6]) }),
+  }));
+
+const parse_scenario = (name: string, block: string): FormatterScenario => {
+  const runs = RUNS_RE.exec(block);
+  const summary = slice_section(
+    block,
+    "Summary\n",
+    "Memory Usage:",
+    " benchmark complete!",
+  );
+  const timings = parse_timings(block);
+  // A scenario banner with no timings under it means the timing lines changed
+  // shape, not that the harness measured nothing — hyperfine always prints them.
+  if (timings.length === 0) {
+    throw new Error(
+      `formatter benchmarks: scenario "${name}" has no parseable timings`,
+    );
+  }
+  // Distinguish "not measured" from "misparsed": these sections are optional (no
+  // GNU time, no preflight in the JSX scenarios), but a section that's present
+  // and yields no rows is a broken pattern.
+  const memory = parse_memory(block);
+  if (block.includes("Memory Usage:") && memory.length === 0) {
+    throw new Error(
+      `formatter benchmarks: scenario "${name}" has an unparseable memory section`,
+    );
+  }
+  const preflight = parse_preflight(block);
+  if (block.includes(PREFLIGHT_HEADING) && preflight.length === 0) {
+    throw new Error(
+      `formatter benchmarks: scenario "${name}" has an unparseable preflight section`,
+    );
+  }
+  return {
+    id: to_slug(name),
+    name,
+    target: TARGET_RE.exec(block)?.[1] ?? "",
+    warmup_runs: Number(runs?.[1] ?? 0),
+    benchmark_runs: Number(runs?.[2] ?? 0),
+    preflight,
+    timings,
+    baseline: SPEEDUP_BASELINE_RE.exec(block)?.[1] ?? "",
+    speedups: [...summary.matchAll(SPEEDUP_RE)].map((m) => ({
+      name: m[3]!.trim(),
+      ratio: Number(m[1]),
+      ratio_stddev: Number(m[2]),
+    })),
+    memory,
+  };
+};
+
+/**
+ * Parse the formatter comparison out of the bench harness's README, keeping only
+ * the scenarios tsv runs in.
+ *
+ * Throws rather than returning a partial result: the harness publishes no JSON,
+ * so this parses prose, and a drifted heading or timing line would otherwise
+ * strip scenarios from the site silently. The caller decides what a MISSING
+ * README means (the sibling checkout is optional); everything past that point is
+ * a broken contract.
+ *
+ * @param readme - the full README text, markers included
+ * @returns the parsed benchmarks
+ * @throws if the results markers, the scenario banners, the versions list, the
+ * machine line, or any tsv scenario's numbers can't be parsed
+ */
+export const parse_formatter_benchmarks = (
+  readme: string,
+): FormatterBenchmarks => {
+  const start = readme.indexOf(RESULTS_START);
+  const end = readme.indexOf(RESULTS_END);
+  if (start === -1 || end === -1 || end < start) {
+    throw new Error(
+      `formatter benchmarks: no ${RESULTS_START} / ${
+        RESULTS_END
+      } block — is this the harness's readme?`,
+    );
+  }
+  const results = readme.slice(start + RESULTS_START.length, end);
+
+  // Split on the scenario banners, pairing each title with the text that follows
+  // it up to the next banner.
+  const headings = [...results.matchAll(SCENARIO_RE)];
+  if (headings.length === 0) {
+    throw new Error(
+      "formatter benchmarks: results block carries no scenario banners",
+    );
+  }
+  const parsed = headings.map(({ 0: heading, 1: name, index }, i) =>
+    parse_scenario(
+      name!.trim(),
+      results.slice(index + heading.length, headings[i + 1]?.index),
+    ),
+  );
+  // tsv has no JSX/TSX parser, so it sits out some scenarios by design — but if it
+  // ran in NONE of them, either the harness stopped benching tsv or the timing
+  // labels drifted, and the site would render a comparison without its subject.
+  const scenarios = parsed.filter((scenario) =>
+    scenario.timings.some((timing) => timing.name === "tsv"),
+  );
+  if (scenarios.length === 0) {
+    throw new Error(
+      `formatter benchmarks: no scenario includes a tsv row (found ${parsed
+        .map((s) => s.id)
+        .join(", ")})`,
+    );
+  }
+
+  const versions: Record<string, string> = {};
+  const versions_block = VERSIONS_RE.exec(readme)?.[1] ?? "";
+  for (const m of versions_block.matchAll(VERSION_RE)) {
+    versions[m[1]!.toLowerCase()] = m[2]!.trim();
+  }
+  if (!versions.tsv) {
+    throw new Error(
+      "formatter benchmarks: no tsv version in the readme's `## Versions` list",
+    );
+  }
+
+  // The ratios move with the core count, so a report that can't say which machine
+  // produced it isn't publishable.
+  const machine = MACHINE_RE.exec(readme)?.[1]?.trim();
+  if (!machine) {
+    throw new Error("formatter benchmarks: no `_Measured on: …_` machine line");
+  }
+
+  return { machine, versions, scenarios };
+};
diff --git a/src/routes/docs/introduction/+page.svelte b/src/routes/docs/introduction/+page.svelte
index dfefa5f..abe7b30 100644
--- a/src/routes/docs/introduction/+page.svelte
+++ b/src/routes/docs/introduction/+page.svelte
@@ -4,15 +4,15 @@
 	import TomeLink from '@fuzdev/fuz_ui/TomeLink.svelte';
 	import TomeSection from '@fuzdev/fuz_ui/TomeSection.svelte';
 	import TomeSectionHeader from '@fuzdev/fuz_ui/TomeSectionHeader.svelte';
-	import {tome_get_by_slug} from '@fuzdev/fuz_ui/tome.ts';
+	import { tome_get_by_slug } from '@fuzdev/fuz_ui/tome.ts';
 	import Svg from '@fuzdev/fuz_ui/Svg.svelte';
-	import {logo_tsv} from '@fuzdev/fuz_ui/logos.ts';
+	import { logo_tsv } from '@fuzdev/fuz_ui/logos.ts';
 
 	const LIBRARY_ITEM_NAME = 'introduction';
 
 	const tome = tome_get_by_slug(LIBRARY_ITEM_NAME);
 
-	const usage_example = `import {format_svelte, parse_svelte, type Root} from '@fuzdev/tsv_wasm';
+	const usage_example = `import {format_svelte, parse_svelte, type Root} from '@fuzdev/tsv';
 
 const formatted = format_svelte('<script>\\nconst   x=1\\n<\\/script>');
 const ast: Root = parse_svelte('<script>const x = 1;<\\/script>');`;
@@ -25,10 +25,10 @@ const formatted = format_svelte('<script>\\nconst   x=1\\n<\\/script>');`;
 
 const ast: Root = parse_svelte('<script>const x = 1;<\\/script>');`;
 
-	const no_locations_example = `import {parse_typescript_no_locations, reconstruct_locations} from '@fuzdev/tsv_parse_wasm';
+	const no_locations_example = `import {parse_typescript, reconstruct_locations} from '@fuzdev/tsv_parse_wasm';
 
 // span-only AST: start/end offsets, no per-node loc (~46% smaller)
-const ast = parse_typescript_no_locations('const x = 1;');
+const ast = parse_typescript('const x = 1;', {locations: false});
 
 // derive line/column back when you need it, no re-parse
 reconstruct_locations(ast, 'const x = 1;');`;
@@ -38,54 +38,71 @@ reconstruct_locations(ast, 'const x = 1;');`;
 	<section>
 		<Svg data={logo_tsv} size="var(--icon_size_xl2)" class="float:right ml_lg mb_lg" />
 		<p>
-			tsv is a toolchain for TypeScript/JS, CSS, and Svelte in Rust. The first release has a
-			formatter that closely follows <a href="https://prettier.io/">Prettier</a> +
+			tsv is a toolchain for TypeScript/JS, CSS, and Svelte in Rust. It ships a formatter that
+			closely follows <a href="https://prettier.io/">Prettier</a> +
 			<a href="https://github.com/sveltejs/prettier-plugin-svelte">prettier-plugin-svelte</a>, and a
 			drop-in replacement for <a href="https://svelte.dev/">Svelte</a>'s parser +
 			<a href="https://github.com/acornjs/acorn">acorn</a> +
 			<a href="https://github.com/sveltejs/acorn-typescript">acorn-typescript</a>.
 		</p>
 		<p>
-			Compared to Oxc, Biome, and SWC, tsv is a set of focused tools, not a generic language
-			platform, so the focus is web standards and there's no support for JSX/SCSS/etc, beyond Svelte
-			as the only JS framework. The extensibility story is currently limited to using its Rust
-			crates as libraries; bridging to JS or WASM plugins is an open question, but may not be
-			supported.
+			Compared to Oxc, Biome, and SWC, tsv is a set of focused tools, not an extensible language
+			platform, so the focus is Web standards + Svelte and there's no support for JSX/SCSS/etc.
+			tsv's extensibility story is currently limited to using its Rust crates as libraries (or
+			forking); bridging to JS or WASM plugins is an open question (leaning against).
+		</p>
+		<p>
+			Compared to <a href="https://github.com/baseballyama/rsvelte">rsvelte</a>, tsv has its own
+			TS/JS/CSS parsers instead of using Oxc, and rsvelte additionally has a compiler and
+			linter/typechecker integration (tsv has some in-progress work here, scope unknown).
 		</p>
 		<p>tsv prioritizes, in order:</p>
 		<ol>
 			<li>correctness (Svelte and TypeScript conformance, spec adherence for HTML/CSS/JS)</li>
 			<li>speed</li>
 			<li>binary size and memory usage</li>
-			<li>extensibility (valued but deprioritized)</li>
+			<li>extensibility (valued but deprioritized), modularity, and reusability</li>
 		</ol>
 		<p>
-			See the <a href="https://tsv.fuz.dev/docs/benchmarks">benchmarks</a> for stats. Compared to Oxc
-			and Biome, tsv is significantly faster, smaller, and uses less memory to parse and format its supported
-			languages
+			See the <TomeLink slug="benchmarks" /> for stats. Compared to Oxc and Biome, tsv is faster,
+			smaller, and uses less memory to parse and format its supported languages. One reason for tsv
+			to exist is to help find the performance bonuses left on the table in the Web ecosystem's
+			increasingly-native implementations.
 		</p>
 		<p>
-			This is an early release, and reports and feedback are appreciated - see the
+			This is an early release with many bugs (and fixes to bugs in Prettier and
+			prettier-plugin-svelte), and reports and feedback are appreciated. See the
 			<a href="https://github.com/fuzdev/tsv/issues">issues</a> and
 			<a href="https://github.com/fuzdev/tsv/discussions">discussions</a>.
 		</p>
 		<p>
-			AI disclosure: this codebase is mostly LLM-generated, and the usual caveats apply. The first
-			release took 7 months and ~1800 manual commits. It's a high-effort project that prioritizes
-			quality.
+			AI disclosure: this codebase is mostly LLM-generated, and the usual caveats apply. It's a
+			high-effort project that prioritizes quality.
 		</p>
 		<p>
-			These docs are a work in progress. For design details see the <a
-				href="https://github.com/fuzdev/tsv">readme</a
-			>.
+			These docs are a work in progress. For design details see the
+			<a href="https://github.com/fuzdev/tsv">readme</a>.
 		</p>
 		<TomeSection>
 			<TomeSectionHeader text="Install" />
-			<p>tsv ships as WASM packages on npm, a CLI with a formatter and parser:</p>
+			<p>On Node.js and Bun, tsv installs as a native addon with prebuilt binaries:</p>
 			<Code
 				lang="sh"
-				content={'npm i -D @fuzdev/tsv_wasm\nnpx tsv format src\nnpx tsv parse src/foo.svelte'}
+				content={'npm i -D @fuzdev/tsv\nnpx tsv format src\nnpx tsv parse src/foo.svelte'}
 			/>
+			<p>
+				The right binary installs automatically. Prebuilt for Linux (x64, arm64, and x64 musl),
+				macOS arm64, and Windows x64 — anywhere else, use the WASM build below. The <code>tsv</code>
+				command here is tsv's real native CLI binary, shipped in the platform package and exec'd
+				directly — multi-file parallelism (<code>--jobs</code>), parallel discovery, the works. It
+				ships beside the addon because neither can play the other's role: an addon can't be exec'd
+				as a process, and an executable can't be loaded as an in-process module.
+			</p>
+			<p>
+				tsv also ships as WASM, which runs everywhere including browsers and Deno, and carries the
+				same <code>tsv</code> CLI:
+			</p>
+			<Code lang="sh" content={'npm i -D @fuzdev/tsv_wasm\nnpx tsv format src'} />
 			<p>For smaller builds, the formatter and parser also ship solo:</p>
 			<Code
 				lang="sh"
@@ -94,14 +111,14 @@ reconstruct_locations(ast, 'const x = 1;');`;
 			<p>
 				See the <TomeLink slug="benchmarks" /> for size and performance details.
 			</p>
-			<p>
-				Native builds are not yet available but are coming in v0.2, see
-				<a href="https://github.com/fuzdev/tsv/issues/139">issue 139</a>.
-			</p>
 		</TomeSection>
 		<TomeSection>
 			<TomeSectionHeader text="Usage" />
-			<p>All three packages share the same API. The full package exports both halves:</p>
+			<p>
+				All four packages share the same formatter and parser API — <code>@fuzdev/tsv</code> and
+				<code>@fuzdev/tsv_wasm</code> are drop-in swaps for each other, same function names, same
+				options, same errors. Both export the formatter and parser together:
+			</p>
 			<Code lang="ts" content={usage_example} />
 			<p>The formatter alone:</p>
 			<Code lang="ts" content={format_example} />
@@ -110,38 +127,60 @@ reconstruct_locations(ast, 'const x = 1;');`;
 			<p>
 				<code>format_typescript</code>, <code>format_css</code>, <code>parse_typescript</code>, and
 				<code>parse_css</code> work the same way, and the parsers return Svelte-compatible JSON ASTs
-				with bundled TS types. Everything works zero-config in Node.js, Bun, and Deno (sync
-				auto-init); browsers and bundlers call <code>await init()</code> once first.
+				with bundled TS types. Every parser also takes an acorn-style options object —
+				<code>{'{locations: false}'}</code> for the span-only wire (below), plus TypeScript's
+				<code>{"{goal: 'script' | 'module'}"}</code>. The native package needs no initialization;
+				the WASM packages work zero-config in Node.js, Bun, and Deno (sync auto-init), and browsers
+				and bundlers call <code>await init()</code> once first.
 			</p>
 		</TomeSection>
 		<TomeSection>
 			<TomeSectionHeader text="Span-only parsing" />
 			<p>
-				For TypeScript and Svelte, the parsers also emit a span-only AST that drops the per-node
-				<code>loc</code> (line/column) object — Svelte also drops <code>name_loc</code> — for a ~46%
-				smaller, faster-to-materialize result, mirroring acorn's <code>locations: false</code>. Line
-				and column stay derivable from the <code>start</code>/<code>end</code> offsets plus your source,
-				so nothing is lost when you have the source.
+				For efficiency, the parsers have a span-only mode that skips the per-node line/column,
+				making the AST ~46% smaller and faster to materialize. You can derive line and column later
+				without re-parsing. This is the default in oxc-parser.
 			</p>
 			<Code lang="ts" content={no_locations_example} />
 			<p>
-				<code>reconstruct_locations(ast, source)</code> walks the tree and adds <code>loc</code>
-				back, mutating in place — exact for TypeScript, approximate for Svelte (it skips the parser's
-				own
-				<code>name_loc</code> and a couple of position quirks). For sparse lookups,
-				<code>create_locator(source)</code> reuses one line table across calls. CSS has no
-				<code>loc</code>, so there's no span-only variant for it.
+				Passing <code>{'{locations: false}'}</code> is faster than the default, because there's
+				fewer bytes to emit and parse. Even when you need line/column, reconstructing in JS beats
+				the <code>loc</code>-bearing wire end-to-end by ~1.7x on TypeScript (~2.2x for a few
+				positions). tsv's default emits <code>loc</code> so that the bare call is a drop-in for
+				Svelte's parser. The <code>reconstruct_locations</code> helper is bundled in every package
+				that parses, native and WASM alike.
 			</p>
+			<p>Details:</p>
+			<ul>
+				<li>
+					Span-only drops the per-node <code>loc</code> object (and <code>name_loc</code> on Svelte
+					nodes), mirroring acorn's <code>locations: false</code>. The rest is unchanged, so every
+					node keeps its <code>start</code>/<code>end</code> offsets.
+				</li>
+				<li>
+					<code>reconstruct_locations(ast, source)</code> walks the tree and adds <code>loc</code>
+					back, mutating in place.
+				</li>
+				<li>
+					For sparse lookups, <code>create_locator(source)</code> reuses one line table across
+					calls, so you pay for the positions you actually ask for.
+				</li>
+				<li>
+					CSS nodes carry no <code>loc</code> to begin with, so <code>{'{locations: false}'}</code>
+					is accepted as an inert no-op there.
+				</li>
+			</ul>
 		</TomeSection>
 		<TomeSection>
 			<TomeSectionHeader text="Source code" />
 			<ul>
 				<li>
-					<a href="https://github.com/fuzdev/tsv">github.com/fuzdev/tsv</a> - the formatter, parser, wasm
-					bindings, CLI, etc
+					<a href="https://github.com/fuzdev/tsv">github.com/fuzdev/tsv</a> — the formatter, parser,
+					wasm bindings, CLI, etc
 				</li>
 				<li>
-					<a href="https://github.com/fuzdev/tsv.fuz.dev">github.com/fuzdev/tsv.fuz.dev</a> - this website
+					<a href="https://github.com/fuzdev/tsv.fuz.dev">github.com/fuzdev/tsv.fuz.dev</a> — this
+					website
 				</li>
 			</ul>
 		</TomeSection>
diff --git a/src/routes/docs/playground/+page.svelte b/src/routes/docs/playground/+page.svelte
index f9c38ed..ee1610f 100644
--- a/src/routes/docs/playground/+page.svelte
+++ b/src/routes/docs/playground/+page.svelte
@@ -1,16 +1,16 @@
 <script lang="ts">
-	import {page} from '$app/state';
+	import { page } from '$app/state';
 	import TomeContent from '@fuzdev/fuz_ui/TomeContent.svelte';
 	import TomeLink from '@fuzdev/fuz_ui/TomeLink.svelte';
-	import {tome_get_by_slug} from '@fuzdev/fuz_ui/tome.ts';
-	import {DOCS_PATH} from '@fuzdev/fuz_ui/docs_helpers.svelte.ts';
+	import { tome_get_by_slug } from '@fuzdev/fuz_ui/tome.ts';
+	import { DOCS_PATH } from '@fuzdev/fuz_ui/docs_helpers.svelte.ts';
 
 	import Playground from './Playground.svelte';
 
 	const tome = tome_get_by_slug('playground');
 
 	// The `/docs` index renders every tome's component via `DocsContent`, which would
-	// mount `Playground` and pull in its ~900KB WASM. Guard like fuz_css's api tome:
+	// mount `Playground` and pull in its ~900KB-gzipped WASM. Guard like fuz_css's api tome:
 	// show only a link at the root, the full playground at `/docs/playground`.
 	const at_root = $derived(page.url.pathname === DOCS_PATH);
 </script>
@@ -23,15 +23,16 @@
 	{:else}
 		<section>
 			<p>
-				This loads <a href="https://www.npmjs.com/package/@fuzdev/tsv_wasm"
-					><code>@fuzdev/tsv_wasm</code></a
-				> in your browser to format and parse Svelte with TypeScript and CSS.
+				This loads
+				<a href="https://www.npmjs.com/package/@fuzdev/tsv_wasm"><code>@fuzdev/tsv_wasm</code></a>
+				in your browser to format and parse Svelte with TypeScript and CSS.
 			</p>
 			<Playground />
 			<p>
 				See the <TomeLink slug="introduction" /> for setup and API usage. The textarea above uses
 				<a href="https://code.fuz.dev/">fuz_code</a>'s
-				<a href="https://code.fuz.dev/docs/api/CodeTextarea.svelte"><code>CodeTextarea</code></a> component.
+				<a href="https://code.fuz.dev/docs/api/CodeTextarea.svelte"><code>CodeTextarea</code></a>
+				component.
 			</p>
 		</section>
 	{/if}
diff --git a/src/routes/docs/playground/Playground.svelte b/src/routes/docs/playground/Playground.svelte
index ba20a09..980fba7 100644
--- a/src/routes/docs/playground/Playground.svelte
+++ b/src/routes/docs/playground/Playground.svelte
@@ -5,13 +5,14 @@
 
 	import Code from '@fuzdev/fuz_code/Code.svelte';
 	import CodeTextarea from '@fuzdev/fuz_code/CodeTextarea.svelte';
-	import {supports_css_highlight_api} from '@fuzdev/fuz_code/highlight_manager.ts';
-	import {to_error_message} from '@fuzdev/fuz_util/error.ts';
+	import { supports_css_highlight_api } from '@fuzdev/fuz_code/highlight_manager.ts';
+	import CopyToClipboard from '@fuzdev/fuz_ui/CopyToClipboard.svelte';
+	import { to_error_message } from '@fuzdev/fuz_util/error.ts';
 
-	import {playground_example} from './playground_example.ts';
+	import { playground_example } from './playground_example.ts';
 
 	// `@fuzdev/tsv_wasm` is loaded lazily, in the browser only — a dynamic import
-	// so the ~900KB WASM lands in its own chunk, fetched the first time this
+	// so the ~900KB-gzipped WASM lands in its own chunk, fetched the first time this
 	// component mounts and never pulled into `/docs` or the prerendered HTML.
 	let tsv: typeof import('@fuzdev/tsv_wasm') | null = $state(null);
 	let load_error: string | null = $state(null);
@@ -23,7 +24,7 @@
 	const ready = $derived(tsv !== null);
 
 	// A tsv call's outcome: its string result, or the thrown error's message.
-	type Outcome = {value: string; error: null} | {value: null; error: string};
+	type Outcome = { value: string; error: null } | { value: null; error: string };
 
 	// Run a tsv call, capturing a thrown error as a message; `null` until the WASM
 	// loads. Lets `formatted` and `ast` share one shape and recompute as `source` changes
@@ -31,9 +32,9 @@
 	const run = (fn: (t: NonNullable<typeof tsv>) => string): Outcome | null => {
 		if (!tsv) return null;
 		try {
-			return {value: fn(tsv), error: null};
+			return { value: fn(tsv), error: null };
 		} catch (err) {
-			return {value: null, error: to_error_message(err)};
+			return { value: null, error: to_error_message(err) };
 		}
 	};
 
@@ -72,6 +73,8 @@
 		};
 	});
 
+	const is_base = $derived(source === playground_example);
+
 	const reset = (): void => {
 		source = playground_example;
 	};
@@ -84,8 +87,8 @@
 	};
 </script>
 
-<header class="row">
-	<button type="button" class="plain" onclick={reset} disabled={!ready}>reset</button>
+<header class="row mb_xs">
+	<button type="button" class="plain" onclick={reset} disabled={!ready || is_base}>reset</button>
 	<button type="button" class="plain" onclick={format} disabled={!ready || error !== null}>
 		format
 	</button>
@@ -112,7 +115,10 @@
 		<p>formatted</p>
 		<Code lang="svelte" content={formatted?.value ?? ''} />
 		<p>AST</p>
-		<Code lang="json" content={ast?.value ?? ''} class="ast" />
+		<div class="ast_output">
+			<CopyToClipboard text={ast?.value ?? ''} class="ast_copy" />
+			<Code lang="json" content={ast?.value ?? ''} class="ast" />
+		</div>
 	{/if}
 </section>
 
@@ -132,6 +138,24 @@
 	section :global(.ast) {
 		max-height: 500px;
 	}
+	/* float a copy button over the AST pane's top-right corner; it stays pinned as
+	   the pane scrolls since it's absolute to this wrapper, not inside the scroller */
+	.ast_output {
+		position: relative;
+	}
+	.ast_output :global(.ast_copy) {
+		--font_size: var(--font_size_lg);
+		position: absolute;
+		top: var(--space_xs);
+		/* clear the pane's scrollbar */
+		right: var(--space_md);
+		z-index: 1;
+		background: var(--shade_00);
+	}
+	/* TODO hacky */
+	.ast_output :global(.ast_copy > div) {
+		width: auto !important;
+	}
 	.error {
 		color: var(--color_e_40);
 		white-space: pre-wrap;
diff --git a/src/routes/docs/tomes.ts b/src/routes/docs/tomes.ts
index 733ca43..b6369cb 100644
--- a/src/routes/docs/tomes.ts
+++ b/src/routes/docs/tomes.ts
@@ -1,31 +1,31 @@
-import type {Tome} from '@fuzdev/fuz_ui/tome.ts';
-import IntroductionPage from './introduction/+page.svelte';
-import PlaygroundPage from './playground/+page.svelte';
-import BenchmarksPage from './benchmarks/+page.svelte';
+import type { Tome } from "@fuzdev/fuz_ui/tome.ts";
+import IntroductionPage from "./introduction/+page.svelte";
+import PlaygroundPage from "./playground/+page.svelte";
+import BenchmarksPage from "./benchmarks/+page.svelte";
 
 export const tomes: Array<Tome> = [
-	{
-		slug: 'introduction',
-		category: 'guide',
-		Component: IntroductionPage,
-		related_tomes: ['playground', 'benchmarks'],
-		related_modules: [],
-		related_declarations: [],
-	},
-	{
-		slug: 'playground',
-		category: 'guide',
-		Component: PlaygroundPage,
-		related_tomes: ['introduction', 'benchmarks'],
-		related_modules: [],
-		related_declarations: [],
-	},
-	{
-		slug: 'benchmarks',
-		category: 'guide',
-		Component: BenchmarksPage,
-		related_tomes: ['introduction', 'playground'],
-		related_modules: [],
-		related_declarations: [],
-	},
+  {
+    slug: "introduction",
+    category: "guide",
+    Component: IntroductionPage,
+    related_tomes: ["playground", "benchmarks"],
+    related_modules: [],
+    related_declarations: [],
+  },
+  {
+    slug: "playground",
+    category: "guide",
+    Component: PlaygroundPage,
+    related_tomes: ["introduction", "benchmarks"],
+    related_modules: [],
+    related_declarations: [],
+  },
+  {
+    slug: "benchmarks",
+    category: "guide",
+    Component: BenchmarksPage,
+    related_tomes: ["introduction", "playground"],
+    related_modules: [],
+    related_declarations: [],
+  },
 ];
diff --git a/src/routes/example.test.ts b/src/routes/example.test.ts
deleted file mode 100644
index 57684dd..0000000
--- a/src/routes/example.test.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-import {assert, test} from 'vitest';
-
-test('tests work', () => {
-	assert.strictEqual('ok', 'OK'.toLowerCase());
-});
diff --git a/src/routes/library.ts b/src/routes/library.ts
index b2aa8df..9706e2c 100644
--- a/src/routes/library.ts
+++ b/src/routes/library.ts
@@ -1,5 +1,5 @@
-import {library_json_from_modules} from '@fuzdev/fuz_util/library_json.ts';
-import {modules} from 'virtual:svelte-docinfo';
-import pkg_json from 'virtual:pkg.json';
+import { library_json_from_modules } from "@fuzdev/fuz_util/library_json.ts";
+import { modules } from "virtual:svelte-docinfo";
+import pkg_json from "virtual:pkg.json";
 
 export const library_json = library_json_from_modules(pkg_json, modules);
diff --git a/src/test/benchmark_data.test.ts b/src/test/benchmark_data.test.ts
index 0f6e8d0..7b477b4 100644
--- a/src/test/benchmark_data.test.ts
+++ b/src/test/benchmark_data.test.ts
@@ -1,57 +1,1103 @@
-import {assert, describe, test} from 'vitest';
+import { assert, describe, test } from "vitest";
 
-import {benchmarks_json} from '$routes/docs/benchmarks/benchmarks.ts';
+import { benchmarks_json } from "$routes/docs/benchmarks/benchmarks.ts";
+import { benchmarks_conformance_json } from "$routes/docs/benchmarks/benchmarks_conformance.ts";
+import { benchmarks_cross_runtime_json } from "$routes/docs/benchmarks/benchmarks_cross_runtime.ts";
+import { benchmarks_formatters_json } from "$routes/docs/benchmarks/benchmarks_formatters.ts";
 import {
-	derive_benchmark_groups,
-	derive_speedup_summary,
-} from '$routes/docs/benchmarks/benchmark_data.ts';
+  benchmarks_cli,
+  CLI_LABELS,
+  CLI_OPTIONAL_SCENARIO_KEYS,
+  CLI_SCENARIO_KEYS,
+  cli_memory_ratio_range,
+  cli_speedup_vs_tsv,
+  CLI_TS_REPO_KEY,
+  CLI_TS_REPO_KEY_LEGACY,
+} from "$routes/docs/benchmarks/benchmarks_cli.ts";
+import {
+  benchmark_speedup,
+  categorize_size_capability,
+  compute_baseline_ratio,
+  derive_benchmark_groups,
+  derive_conformance_groups,
+  derive_corpus_repos,
+  derive_cross_runtime_groups,
+  derive_size_groups,
+  derive_speedup_summary,
+  derive_unavailable_by_runtime,
+  format_coverage_percent,
+  is_impl_unavailable,
+  format_ratio_approx,
+  format_ratio_range,
+  format_ratio_range_approx,
+  format_speedup_signed,
+  order_cross_runtime_runtimes,
+  OXC_FULL_LABEL,
+  RSVELTE_INSTALL_LABEL,
+  RSVELTE_LABEL,
+  OXFMT_WASM_LABEL,
+  type CrossRuntimeReport,
+} from "$routes/docs/benchmarks/benchmark_data.ts";
 
 // Shape gate for the committed benchmarks.json: the bench report format drifts
 // (it once went 3 months stale across a key rename that rendered as `undefined`),
 // and `benchmarks.ts` casts the JSON, so typechecking alone won't catch it.
 // When `npm run update-benchmarks` pulls in a new shape, these fail loudly.
-describe('benchmarks.json shape', () => {
-	test('baseline version is current', () => {
-		assert.isAtLeast(benchmarks_json.version, 4);
-	});
-
-	test('binary sizes include the ratio anchors', () => {
-		const labels = benchmarks_json.binary_sizes.map((s) => s.label);
-		assert.include(labels, 'tsv (native)'); // native anchor
-		assert.include(labels, 'tsv_wasm'); // wasm anchor (the full build)
-	});
-
-	test('versions carries the keys the meta component renders', () => {
-		const {versions} = benchmarks_json;
-		assert.isString(versions.svelte);
-		assert.isString(versions.acorn_ts);
-		assert.isString(versions.prettier);
-		assert.isString(versions.prettier_svelte);
-	});
-
-	test('corpus covers every benchmarked language', () => {
-		for (const language of ['svelte', 'typescript', 'css']) {
-			assert.isAbove(benchmarks_json.corpus[language] ?? 0, 0, language);
-		}
-	});
-
-	test('every group derives a canonical entry and a timed-set count', () => {
-		const groups = derive_benchmark_groups(benchmarks_json);
-		assert.isAtLeast(groups.length, 6); // format+parse × svelte/typescript/css
-		for (const group of groups) {
-			const key = `${group.operation}/${group.language}`;
-			assert.ok(group.canonical_entry, `${key} has no canonical entry`);
-			assert.isNotNull(group.files_iterated, `${key} has no files_iterated`);
-		}
-	});
-
-	test('speedup summary is fully populated', () => {
-		const rows = derive_speedup_summary(derive_benchmark_groups(benchmarks_json));
-		assert.strictEqual(rows.length, 2); // native + wasm
-		for (const row of rows) {
-			assert.isDefined(row.format_svelte, row.variant);
-			assert.isDefined(row.format_typescript, row.variant);
-			assert.isDefined(row.format_css, row.variant);
-		}
-	});
+describe("benchmarks.json shape", () => {
+  test("baseline version is current", () => {
+    // version 5 is the first per-runtime report shape (carries `runtime`)
+    assert.isAtLeast(benchmarks_json.version, 5);
+  });
+
+  test("binary sizes include the flagship tsv builds", () => {
+    const labels = benchmarks_json.binary_sizes.map((s) => s.label);
+    assert.include(labels, "tsv (napi)"); // flagship N-API build (perf report anchor)
+    assert.include(labels, "tsv_wasm"); // the full wasm build — smallest full-toolchain, size baseline
+  });
+
+  test("versions carries the keys the meta component renders", () => {
+    const { versions } = benchmarks_json;
+    assert.isString(versions.svelte);
+    assert.isString(versions.acorn_ts);
+    assert.isString(versions.prettier);
+    assert.isString(versions.prettier_svelte);
+  });
+
+  test("corpus covers every benchmarked language", () => {
+    for (const language of ["svelte", "typescript", "css"]) {
+      assert.isAbove(benchmarks_json.corpus[language] ?? 0, 0, language);
+    }
+  });
+
+  test("every group leads with its canonical entry (the default anchor) and a timed-set count", () => {
+    const groups = derive_benchmark_groups(benchmarks_json);
+    assert.isAtLeast(groups.length, 6); // format+parse × svelte/typescript/css
+    for (const group of groups) {
+      const key = `${group.operation}/${group.language}`;
+      assert.ok(group.canonical_entry, `${key} has no canonical entry`);
+      // the canonical reference sorts first, so it's the default 1.0x anchor the
+      // shared component reads off the leading row
+      assert.strictEqual(
+        group.entries[0]?.category,
+        "canonical",
+        `${key} canonical leads`,
+      );
+      assert.isNotNull(group.files_iterated, `${key} has no files_iterated`);
+      for (const entry of group.entries) {
+        if (entry.disabled) continue;
+        // measured entries render the whole-sweep mean (total corpus time); a
+        // zero would misread as an instantaneous run
+        assert.isAbove(entry.mean_ns, 0, `${key}/${entry.name} has no mean`);
+      }
+    }
+  });
+
+  test("svelte/css parse groups get disabled oxc placeholders, typescript keeps real ones", () => {
+    const groups = derive_benchmark_groups(benchmarks_json);
+    const parse = (language: string) =>
+      groups.find((g) => g.operation === "parse" && g.language === language);
+
+    // typescript actually runs oxc-parser — its oxc entries are real, not placeholders
+    const ts = parse("typescript");
+    const ts_oxc = ts?.entries.filter((e) => e.category === "oxc") ?? [];
+    assert.isNotEmpty(ts_oxc);
+    for (const e of ts_oxc)
+      assert.isNotOk(e.disabled, `${e.name} should be a real entry`);
+
+    // svelte and css mirror those oxc entries in, disabled, in the same fixed slot:
+    // directly after the biome placeholder (both lead the cross-tool comparisons,
+    // right after the canonical row) and before tsv's json wires
+    for (const language of ["svelte", "css"]) {
+      const group = parse(language);
+      assert.ok(group, `${language} parse group missing`);
+      const oxc = group.entries.filter((e) => e.category === "oxc");
+      assert.strictEqual(
+        oxc.length,
+        ts_oxc.length,
+        `${language} oxc placeholder count`,
+      );
+      for (const e of oxc) {
+        assert.ok(e.disabled, `${language} ${e.name} should be disabled`);
+        assert.strictEqual(e.bar_fraction, 0, `${language} ${e.name} bar`);
+      }
+      const names = group.entries.map((e) => e.name);
+      const first_biome = names.findIndex((n) => n.includes("biome"));
+      const first_oxc = names.findIndex((n) => n.includes("oxc"));
+      const first_json = names.findIndex(
+        (n) => n.endsWith("-json") || n.endsWith("-no-locations"),
+      );
+      assert.strictEqual(
+        first_oxc,
+        first_biome + 1,
+        `${language} oxc directly after biome`,
+      );
+      assert.isBelow(
+        first_oxc,
+        first_json,
+        `${language} oxc before the tsv json entries`,
+      );
+    }
+  });
+
+  test("yuku appears in the typescript parse group only, and is never mirrored elsewhere", () => {
+    const groups = derive_benchmark_groups(benchmarks_json);
+
+    // The page's yuku prose is unconditional, so the copied report must carry the
+    // rows it describes — this failing means the report needs a refresh.
+    const ts = groups.find(
+      (g) => g.operation === "parse" && g.language === "typescript",
+    );
+    const ts_yuku = ts?.entries.filter((e) => e.category === "yuku") ?? [];
+    assert.isNotEmpty(ts_yuku, "typescript parse must carry yuku rows");
+    for (const e of ts_yuku)
+      assert.isNotOk(e.disabled, `${e.name} should be a real entry`);
+
+    // A grayed-out slot says a tool with WIDER scope is missing this language —
+    // true of biome and oxc, not of a parser that claims nothing wider.
+    for (const group of groups) {
+      if (group.operation !== "parse" || group.language === "typescript")
+        continue;
+      assert.isEmpty(
+        group.entries.filter((e) => e.category === "yuku"),
+        `${group.language} parse must hold no yuku slot`,
+      );
+    }
+  });
+
+  test("every parse group gets a disabled biome placeholder, since biome never exposes a parser to JS", () => {
+    const groups = derive_benchmark_groups(benchmarks_json);
+    for (const language of ["svelte", "typescript", "css"]) {
+      const group = groups.find(
+        (g) => g.operation === "parse" && g.language === language,
+      );
+      assert.ok(group, `${language} parse group missing`);
+      const biome = group.entries.filter((e) => e.category === "biome");
+      assert.strictEqual(
+        biome.length,
+        1,
+        `${language} biome placeholder count`,
+      );
+      const [entry] = biome;
+      assert.ok(entry, `${language} biome entry missing`);
+      assert.ok(entry.disabled, `${language} biome entry should be disabled`);
+      assert.strictEqual(entry.bar_fraction, 0, `${language} biome bar`);
+
+      // biome leads the cross-tool comparisons: directly after the single canonical
+      // row (index 0), before tsv's json wires
+      const names = group.entries.map((e) => e.name);
+      const first_biome = names.findIndex((n) => n.includes("biome"));
+      const first_json = names.findIndex(
+        (n) => n.endsWith("-json") || n.endsWith("-no-locations"),
+      );
+      assert.strictEqual(
+        first_biome,
+        1,
+        `${language} biome directly after the canonical row`,
+      );
+      assert.isBelow(
+        first_biome,
+        first_json,
+        `${language} biome before the tsv json entries`,
+      );
+    }
+  });
+
+  test("svelte gets a disabled dprint placeholder; typescript keeps dprint and css keeps malva real", () => {
+    const groups = derive_benchmark_groups(benchmarks_json);
+    const format = (language: string) =>
+      groups.find((g) => g.operation === "format" && g.language === language);
+    const dprint_rows = (language: string) =>
+      format(language)?.entries.filter((e) => e.category === "dprint") ?? [];
+
+    // typescript actually runs dprint — its entry is real, not a placeholder
+    const ts_dprint = dprint_rows("typescript");
+
+    // The dprint row postdates older reports. With no measured entry there is
+    // nothing to mirror, and the derivation deliberately leaves every group
+    // untouched — so assert exactly that (no invented rows) and stop. Refreshing
+    // the report is what promotes this to the full assertion below.
+    if (ts_dprint.length === 0) {
+      assert.isEmpty(
+        dprint_rows("svelte"),
+        "svelte must not invent a dprint row when the report carries none",
+      );
+      return;
+    }
+    for (const e of ts_dprint)
+      assert.isNotOk(e.disabled, `${e.name} should be a real entry`);
+
+    // css runs dprint's own CSS plugin, malva, through the same Wasm host — a REAL
+    // row that shares dprint's category (see CATEGORY_BY_NAME), so css gets no
+    // placeholder: the mirror only fills a group with no dprint-category entry
+    const css_dprint = dprint_rows("css");
+    assert.deepEqual(
+      css_dprint.map((e) => e.name),
+      ["malva-wasm"],
+      "css carries malva-wasm and no dprint placeholder",
+    );
+    for (const e of css_dprint)
+      assert.isNotOk(e.disabled, `${e.name} should be a real entry`);
+
+    // svelte mirrors the typescript entry in, disabled: `@dprint/typescript`
+    // rejects Svelte outright and the bench loads no Svelte plugin for the host
+    const svelte_dprint = dprint_rows("svelte");
+    assert.strictEqual(
+      svelte_dprint.length,
+      ts_dprint.length,
+      "svelte dprint placeholder count",
+    );
+    for (const e of svelte_dprint) {
+      assert.ok(e.disabled, `svelte ${e.name} should be disabled`);
+      assert.strictEqual(e.bar_fraction, 0, `svelte ${e.name} bar`);
+    }
+
+    // in every group the dprint-category row sits directly after biome in the
+    // shared cross-tool ordering, real or placeholder alike
+    for (const language of ["svelte", "css"]) {
+      const names = format(language)!.entries.map((e) => e.name);
+      const first_biome = names.findIndex((n) => n.includes("biome"));
+      const first_dprint = names.findIndex(
+        (n) => n.includes("dprint") || n.includes("malva"),
+      );
+      assert.strictEqual(
+        first_dprint,
+        first_biome + 1,
+        `${language} dprint-category row directly after biome`,
+      );
+    }
+  });
+
+  test("the coverage-only rsvelte-fmt row is inert but keeps its real coverage", () => {
+    const groups = derive_benchmark_groups(benchmarks_json);
+    const svelte_format = groups.find(
+      (g) => g.operation === "format" && g.language === "svelte",
+    );
+    assert.ok(svelte_format, "svelte format group missing");
+    const rsvelte = svelte_format.entries.find((e) => e.name === "rsvelte-fmt");
+
+    // The row postdates older reports; refreshing the report promotes this to
+    // the full assertion, exactly as the dprint test above works.
+    if (!rsvelte) return;
+
+    // Inert: no bar, and never the ratio anchor — it has no timing to anchor on.
+    assert.ok(rsvelte.disabled, "rsvelte-fmt should render inert");
+    assert.ok(
+      rsvelte.coverage_only,
+      "rsvelte-fmt should be flagged coverage-only",
+    );
+    assert.strictEqual(rsvelte.bar_fraction, 0, "rsvelte-fmt bar");
+
+    // ...but unlike a plain placeholder it DID run, so its coverage is real.
+    // This is the distinction the page renders as `not timed` rather than `n/a`.
+    assert.isNumber(
+      rsvelte.files_processed,
+      "rsvelte-fmt coverage should be present",
+    );
+    assert.isNumber(rsvelte.files_total, "rsvelte-fmt total should be present");
+
+    // It must not have become the group's bar scale: an untimed row coerces to
+    // mean_ns 0, so a regression that let it into `slowest` would silently
+    // rescale every real bar in the group.
+    const timed = svelte_format.entries.filter((e) => !e.disabled);
+    assert.ok(
+      timed.some((e) => e.bar_fraction === 1),
+      "some timed row must still be the full-width bar",
+    );
+
+    // Only format/svelte carries it — it formats nothing else here.
+    for (const group of groups) {
+      if (group === svelte_format) continue;
+      assert.isEmpty(
+        group.entries.filter((e) => e.name === "rsvelte-fmt"),
+        `${group.operation}/${group.language} should carry no rsvelte-fmt row`,
+      );
+    }
+  });
+
+  test("format/parse rows follow the fixed canonical → biome → dprint → oxc → postcss → rsvelte → swc → yuku → json → internal order", () => {
+    // independently mirrors the requested row order (`speed_entry_rank`) so a
+    // regression in the derivation's comparator fails here
+    const tier = (name: string, category: string): number => {
+      if (category === "canonical") return 0;
+      if (category === "biome") return 1;
+      if (category === "dprint") return 2;
+      if (category === "oxc") return 3;
+      if (category === "postcss") return 4;
+      if (category === "rsvelte") return 5;
+      if (category === "swc") return 6;
+      if (category === "yuku") return 7;
+      if (name.endsWith("-no-locations")) return 8; // tsv json, span-only wire
+      if (name.endsWith("-json")) return 9; // tsv json, loc-carrying wire
+      return 10; // tsv internal engine
+    };
+    for (const group of derive_benchmark_groups(benchmarks_json)) {
+      const key = `${group.operation}/${group.language}`;
+      const tiers = group.entries.map((e) => tier(e.name, e.category));
+      assert.deepEqual(
+        tiers,
+        [...tiers].toSorted((a, b) => a - b),
+        `${key} tier order`,
+      );
+      // wasm precedes native within a tier
+      for (let i = 1; i < group.entries.length; i++) {
+        if (tiers[i] !== tiers[i - 1]) continue;
+        const prev_wasm = group.entries[i - 1]!.name.includes("wasm");
+        const curr_wasm = group.entries[i]!.name.includes("wasm");
+        assert.isFalse(
+          !prev_wasm && curr_wasm,
+          `${key} native precedes wasm within a tier`,
+        );
+      }
+    }
+  });
+
+  test("speedup summary is fully populated", () => {
+    const rows = derive_speedup_summary(
+      derive_benchmark_groups(benchmarks_json),
+    );
+    assert.strictEqual(rows.length, 2); // native + wasm
+    for (const row of rows) {
+      assert.isDefined(row.format_svelte, row.variant);
+      assert.isDefined(row.format_typescript, row.variant);
+      assert.isDefined(row.format_css, row.variant);
+    }
+  });
+
+  test("binary sizes group by capability with one smallest-build ratio anchor", () => {
+    const groups = derive_size_groups(benchmarks_json.binary_sizes);
+    // full / formatter / parser, in that order, all present in the current data
+    assert.deepStrictEqual(
+      groups.map((g) => g.capability),
+      ["full", "formatter", "parser"],
+    );
+    for (const group of groups) {
+      assert.isNotEmpty(group.entries);
+      // every entry lands in the group its capability names
+      for (const e of group.entries) {
+        assert.strictEqual(
+          categorize_size_capability(e.label),
+          group.capability,
+        );
+      }
+      // the group's default ratio anchor (its 1.0x row) is the single smallest real
+      // build, and it leads the group — the shared component reads every ratio off
+      // the first row. Disabled placeholders (e.g. oxfmt's absent wasm build) never
+      // sort first.
+      const real = group.entries.filter((e) => !e.disabled);
+      const smallest = real.reduce((a, b) => (a.bytes <= b.bytes ? a : b));
+      assert.strictEqual(
+        group.entries[0]?.label,
+        smallest.label,
+        `${group.capability} smallest leads`,
+      );
+    }
+    // the parser group pits tsv against oxc-parser in both kinds
+    const parser = groups.find((g) => g.capability === "parser");
+    const parser_labels = parser?.entries.map((e) => e.label) ?? [];
+    assert.include(parser_labels, "oxc-parser (wasm)");
+    assert.include(parser_labels, "oxc-parser (napi)");
+  });
+
+  test("full toolchain group carries the combined oxc-parser + oxfmt entry", () => {
+    const sizes = benchmarks_json.binary_sizes;
+    const groups = derive_size_groups(sizes);
+    const full = groups.find((g) => g.capability === "full");
+    const combined = full?.entries.find((e) => e.label === OXC_FULL_LABEL);
+    assert.ok(combined, "combined oxc entry missing from full toolchain group");
+
+    // its bytes and gzip are the sum of oxc's separate parser and formatter builds
+    const oxc_parser = sizes.find((s) => s.label === "oxc-parser (napi)");
+    const oxfmt = sizes.find((s) => s.label === "oxfmt (napi)");
+    assert.ok(oxc_parser && oxfmt, "source oxc builds missing");
+    assert.strictEqual(combined.bytes, oxc_parser.bytes + oxfmt.bytes);
+    assert.strictEqual(
+      combined.gzip_bytes,
+      oxc_parser.gzip_bytes! + oxfmt.gzip_bytes!,
+    );
+
+    // native build, colored as oxc
+    assert.strictEqual(combined.kind, "native");
+    assert.strictEqual(combined.category, "oxc");
+  });
+
+  test("formatter group carries rsvelte-fmt both bare and summed with the oxfmt it needs for a project", () => {
+    const sizes = benchmarks_json.binary_sizes;
+    const groups = derive_size_groups(sizes);
+    const formatter = groups.find((g) => g.capability === "formatter");
+    assert.ok(formatter, "formatter group missing");
+
+    const bare = formatter.entries.find((e) => e.label === RSVELTE_LABEL);
+    // The rsvelte rows postdate older reports; refreshing the report promotes
+    // this to the full assertion, as the dprint test above works.
+    if (!bare) {
+      assert.isEmpty(
+        formatter.entries.filter((e) => e.label === RSVELTE_INSTALL_LABEL),
+        "must not synthesize the rsvelte pair when the report carries no rsvelte build",
+      );
+      return;
+    }
+
+    const combined = formatter.entries.find(
+      (e) => e.label === RSVELTE_INSTALL_LABEL,
+    );
+    assert.ok(
+      combined,
+      "rsvelte-fmt + oxfmt entry missing from formatter group",
+    );
+
+    const oxfmt = sizes.find((s) => s.label === "oxfmt (napi)");
+    assert.ok(oxfmt, "source oxfmt build missing");
+    assert.strictEqual(combined.bytes, bare.bytes + oxfmt.bytes);
+    assert.strictEqual(
+      combined.gzip_bytes,
+      bare.gzip_bytes! + oxfmt.gzip_bytes!,
+    );
+
+    // both are real measured builds, not placeholders — the pair is the project
+    // figure, the bare binary the single-file one
+    assert.isNotOk(bare.disabled, "bare rsvelte-fmt should be a real entry");
+    assert.isNotOk(combined.disabled, "rsvelte pair should be a real entry");
+    assert.strictEqual(combined.kind, "native");
+    for (const e of [bare, combined]) {
+      assert.strictEqual(e.category, "rsvelte", `${e.label} category`);
+    }
+
+    // the sum must sort after its own bare half — a group ordered smallest-first
+    // would otherwise be reporting a sum smaller than one of its addends
+    const labels = formatter.entries.map((e) => e.label);
+    assert.isAbove(
+      labels.indexOf(RSVELTE_INSTALL_LABEL),
+      labels.indexOf(RSVELTE_LABEL),
+      "the rsvelte pair should sort after the bare binary",
+    );
+  });
+
+  test("formatter group gets a disabled oxfmt (wasm) placeholder just above oxfmt (napi), since oxfmt has no wasm build", () => {
+    const groups = derive_size_groups(benchmarks_json.binary_sizes);
+    const formatter = groups.find((g) => g.capability === "formatter");
+    assert.ok(formatter, "formatter group missing");
+
+    const placeholder = formatter.entries.find(
+      (e) => e.label === OXFMT_WASM_LABEL,
+    );
+    assert.ok(placeholder, "oxfmt (wasm) placeholder missing");
+    assert.ok(placeholder.disabled, "oxfmt (wasm) should be disabled");
+    assert.strictEqual(placeholder.kind, "wasm");
+    assert.strictEqual(placeholder.category, "oxc");
+    assert.strictEqual(placeholder.bar_fraction, 0);
+
+    const labels = formatter.entries.map((e) => e.label);
+    const placeholder_index = labels.indexOf(OXFMT_WASM_LABEL);
+    const native_index = labels.indexOf("oxfmt (napi)");
+    assert.isAbove(
+      native_index,
+      -1,
+      "oxfmt (napi) missing from formatter group",
+    );
+    assert.strictEqual(
+      placeholder_index,
+      native_index - 1,
+      "placeholder should sit just above oxfmt (napi)",
+    );
+  });
+
+  test("flagship report is the node runtime", () => {
+    // the headline detailed view switched to N-API under Node; guards against an
+    // `update-benchmarks` that pulls the wrong runtime's sibling report
+    assert.strictEqual(benchmarks_json.runtime, "node");
+  });
+});
+
+// Shape gate for the committed conformance report `benchmarks_conformance.json`
+// (tsv's `report.conformance.node.json` — the parse-coverage surface over the
+// deliberately-hard fixture suites, disjoint from the perf corpus, Svelte set minus
+// canonical-rejects), consumed by the Parse conformance section.
+describe("benchmarks_conformance.json shape", () => {
+  test("report is the conformance surface at the current version", () => {
+    assert.isAtLeast(benchmarks_conformance_json.version, 6);
+    assert.strictEqual(benchmarks_conformance_json.corpus_kind, "conformance");
+    assert.strictEqual(benchmarks_conformance_json.runtime, "node");
+  });
+
+  test("conformance report is parse-only", () => {
+    for (const entry of benchmarks_conformance_json.entries) {
+      assert.match(entry.group, /^parse\//, `${entry.group}/${entry.name}`);
+    }
+  });
+
+  test("corpus sources disclose the composition", () => {
+    assert.isNotEmpty(benchmarks_conformance_json.corpus_sources ?? []);
+  });
+
+  test("derives one coverage group per language, each with a tsv row and full coverage data", () => {
+    const groups = derive_conformance_groups(benchmarks_conformance_json);
+    assert.strictEqual(groups.length, 3); // svelte / typescript / css
+    assert.deepEqual(
+      groups.map((g) => g.language),
+      ["svelte", "typescript", "css"],
+    );
+    for (const group of groups) {
+      assert.ok(
+        group.rows.some((r) => r.name === "tsv"),
+        `${group.language} has a tsv row`,
+      );
+      // rows are ordered by coverage, highest first
+      const fractions = group.rows.map((r) => r.coverage_fraction);
+      assert.deepEqual(
+        fractions,
+        [...fractions].toSorted((a, b) => b - a),
+        `${group.language} rows descend by coverage`,
+      );
+      for (const row of group.rows) {
+        assert.isAbove(
+          row.files_total,
+          0,
+          `${group.language}/${row.name} total`,
+        );
+        assert.isAtLeast(row.coverage_fraction, 0);
+        assert.isAtMost(row.coverage_fraction, 1);
+        // engine-level rows only — binding/materialization variants are folded
+        assert.notMatch(
+          row.name,
+          /-internal|wasm-|-wasm/,
+          `${group.language}/${row.name}`,
+        );
+      }
+    }
+  });
+
+  test("yuku reaches the typescript coverage group through its wasm binding", () => {
+    // The conformance report carries no yuku native row — that binding crashes the
+    // host process on this corpus, so tsv's harness omits it — and the page's note
+    // about it is unconditional. If the row name ever changes, the engine would
+    // silently vanish from the table instead of failing here.
+    const groups = derive_conformance_groups(benchmarks_conformance_json);
+    const ts = groups.find((g) => g.language === "typescript");
+    const yuku = ts?.rows.find((r) => r.name === "yuku-parser");
+    assert.ok(yuku, "typescript coverage must carry a yuku-parser row");
+    // the row's own qualifier, so the table says which binding without the
+    // reader having to reach the note below it
+    assert.strictEqual(yuku.note, "wasm — native segfaults");
+  });
+
+  test("tsc reaches the typescript coverage group, and only it, with its oracle note", () => {
+    // tsc parses TypeScript/JS alone and rides this surface only (it is a verdict,
+    // not a speed). It also SELECTED one slice of this corpus, where it scores 100%
+    // by construction — the note is what keeps the blended aggregate from reading as
+    // one achieved number, so a silent note rename must fail here rather than on the
+    // published page.
+    const groups = derive_conformance_groups(benchmarks_conformance_json);
+    const row_named = (language: string) =>
+      groups
+        .find((g) => g.language === language)
+        ?.rows.find((r) => r.name === "tsc");
+    const tsc = row_named("typescript");
+    assert.ok(tsc, "typescript coverage must carry a tsc row");
+    assert.strictEqual(tsc.note, "oracle for part of this corpus");
+    assert.isUndefined(row_named("svelte"), "tsc parses no Svelte");
+    assert.isUndefined(row_named("css"), "tsc parses no CSS");
+  });
+
+  test("coverage percent floors — only exact totality reads 100%", () => {
+    // 44219/44220 rounds to 100.00% but must not display as it: floor, so a
+    // visibly non-total count never sits beside a "100.00%" label.
+    assert.strictEqual(format_coverage_percent(44_219 / 44_220), "99.99%");
+    assert.strictEqual(format_coverage_percent(1), "100.00%");
+    assert.strictEqual(format_coverage_percent(0.998549), "99.85%");
+    assert.strictEqual(format_coverage_percent(0), "0.00%");
+  });
+});
+
+describe("derive_corpus_repos", () => {
+  test("maps the committed corpus sources to deduped org/name repo links", () => {
+    const repos = derive_corpus_repos(benchmarks_json.corpus_sources);
+    assert.isNotEmpty(repos);
+    // one entry per URL — no repo appears twice even though svelte.dev contributes
+    // several source subpaths
+    const urls = repos.map((r) => r.url);
+    assert.strictEqual(new Set(urls).size, urls.length, "urls are distinct");
+    const svelte_dev = repos.filter(
+      (r) => r.url === "https://github.com/sveltejs/svelte.dev",
+    );
+    assert.strictEqual(
+      svelte_dev.length,
+      1,
+      "svelte.dev collapses to one entry",
+    );
+    // each label is the linkified `org/name`, derived from (and ending) its URL
+    for (const repo of repos) {
+      assert.match(repo.label, /^[^/]+\/[^/]+$/, repo.url);
+      assert.isTrue(
+        repo.url.endsWith(repo.label),
+        `${repo.url} ends with ${repo.label}`,
+      );
+    }
+  });
+
+  test("collapses shared repos and drops sources with no mapped repo", () => {
+    const repos = derive_corpus_repos([
+      { path: "../zzz/src", files: 1 },
+      { path: "../svelte.dev/apps/svelte.dev/src", files: 1 },
+      { path: "../svelte.dev/packages/repl/src", files: 1 }, // same repo → collapsed
+      { path: "benches/js/.cache/svelte_styles", files: 1 }, // not a repo → dropped
+    ]);
+    assert.deepStrictEqual(repos, [
+      { url: "https://github.com/fuzdev/zzz", label: "fuzdev/zzz" },
+      {
+        url: "https://github.com/sveltejs/svelte.dev",
+        label: "sveltejs/svelte.dev",
+      },
+    ]);
+  });
+
+  test("handles a missing corpus_sources field", () => {
+    assert.deepStrictEqual(derive_corpus_repos(undefined), []);
+  });
+});
+
+describe("format_speedup_signed", () => {
+  test("anchor-and-faster entries read as a plain multiple", () => {
+    assert.strictEqual(format_speedup_signed(1), "1.00x");
+    assert.strictEqual(format_speedup_signed(2.5), "2.50x");
+    assert.strictEqual(format_speedup_signed(12.3), "12.3x"); // >= 10 drops to one decimal
+  });
+
+  test("slower entries negate the reciprocal so the factor is directly legible", () => {
+    assert.strictEqual(format_speedup_signed(0.15), "-6.67x");
+    assert.strictEqual(format_speedup_signed(0.05), "-20.0x"); // >= 10 magnitude → one decimal
+    assert.strictEqual(format_speedup_signed(0.98), "-1.02x"); // near-parity sign flip
+  });
+});
+
+describe("compute_baseline_ratio", () => {
+  test("speed reads the anchor as the reference — faster entries exceed 1", () => {
+    // anchor 100ns; a 50ns entry is 2x faster, a 200ns entry is half the speed
+    assert.strictEqual(compute_baseline_ratio("speed", 50, 100), 2);
+    assert.strictEqual(compute_baseline_ratio("speed", 200, 100), 0.5);
+  });
+
+  test("size reads the anchor as the reference — bigger entries exceed 1", () => {
+    // anchor 100 bytes; a 300-byte build is 3x bigger, a 50-byte build is half
+    assert.strictEqual(compute_baseline_ratio("size", 300, 100), 3);
+    assert.strictEqual(compute_baseline_ratio("size", 50, 100), 0.5);
+  });
+});
+
+describe("order_cross_runtime_runtimes", () => {
+  test("reorders the report storage order to node-first display order", () => {
+    assert.deepStrictEqual(
+      order_cross_runtime_runtimes(["deno", "node", "bun"]),
+      ["node", "deno", "bun"],
+    );
+  });
+
+  test("anchors on the next runtime in display order when node is absent", () => {
+    assert.deepStrictEqual(order_cross_runtime_runtimes(["bun", "deno"]), [
+      "deno",
+      "bun",
+    ]);
+    assert.deepStrictEqual(order_cross_runtime_runtimes([]), []);
+  });
+});
+
+// Shape gate for the committed cross-runtime `benchmarks_cross_runtime.json` (the
+// bench composer's combined `report.json`) — a different, slimmer shape than the
+// per-runtime baseline, consumed by the Cross-runtime section.
+describe("benchmarks_cross_runtime.json shape", () => {
+  test("combined report carries the current version and kind", () => {
+    assert.isAtLeast(benchmarks_cross_runtime_json.version, 5);
+    assert.strictEqual(benchmarks_cross_runtime_json.kind, "combined");
+    // the committed fixture must be same-vintage — if this trips, re-run every
+    // runtime and recompose rather than committing a mixed set (the site would
+    // show the unreliable-ratios warning banner)
+    assert.notStrictEqual(benchmarks_cross_runtime_json.mixed_vintage, true);
+  });
+
+  test("the conformance report is same-vintage with the perf siblings", () => {
+    // combined `version` 13 records it; a stale one means `update-benchmarks`
+    // copied a conformance report from a different refresh than the perf trio
+    // (the site would show the parse-conformance section's warning banner)
+    const vintage = benchmarks_cross_runtime_json.conformance_vintage;
+    assert.isOk(vintage, "conformance_vintage recorded");
+    assert.notStrictEqual(vintage!.stale, true);
+    assert.strictEqual(
+      vintage!.git_commit,
+      benchmarks_conformance_json.git_commit,
+    );
+  });
+
+  test("runtimes include the flagship and its cross-runtime peers", () => {
+    const { runtimes } = benchmarks_cross_runtime_json;
+    assert.include(runtimes, "node"); // the flagship the headline view leads with
+    assert.include(runtimes, "deno");
+    assert.include(runtimes, "bun");
+  });
+
+  test("every group derives rows with the flagship runtime populated", () => {
+    const groups = derive_cross_runtime_groups(benchmarks_cross_runtime_json);
+    assert.isAtLeast(groups.length, 6); // format+parse × svelte/typescript/css
+    for (const group of groups) {
+      assert.isAbove(group.rows.length, 0, group.group);
+      for (const row of group.rows) {
+        assert.isNumber(
+          row.ops_per_second.node,
+          `${group.group}/${row.name} missing node ops`,
+        );
+        // ratios anchor on node (the display-order base, not the report's
+        // deno-first storage order), so node's own ratio is exactly 1
+        assert.strictEqual(
+          row.ratio_vs_base.node,
+          1,
+          `${group.group}/${row.name} node anchor`,
+        );
+      }
+    }
+  });
+
+  test("the committed reports timed identical file sets across runtimes", () => {
+    // a mismatch means part of a published ratio is corpus composition, not
+    // runtime — recompose from same-box, same-commit siblings rather than
+    // committing a report that needs the ⚠ files annotation
+    const groups = derive_cross_runtime_groups(benchmarks_cross_runtime_json);
+    for (const group of groups) {
+      for (const row of group.rows) {
+        assert.isNull(
+          row.files_iterated_mismatch,
+          `${group.group}/${row.name} file-set mismatch`,
+        );
+      }
+    }
+  });
+});
+
+// Per-runtime load failures (the composer's `unavailable_by_runtime`, combined
+// `version` 9+ — it carried init-line labels under `impls` at 8, which matched no
+// row name). Synthetic reports: the committed one predates the field, and the
+// point of these is the DISTINCTION the field draws — a runtime that couldn't load
+// the impl behind a row versus a report that simply has no such row. Both render
+// as `fail`.
+describe("derive_unavailable_by_runtime", () => {
+  const report = (
+    unavailable_by_runtime?: CrossRuntimeReport["unavailable_by_runtime"],
+  ): CrossRuntimeReport => ({
+    version: 9,
+    kind: "combined",
+    generated: "2026-01-01T00:00:00.000Z",
+    runtimes: ["deno", "node", "bun"],
+    unavailable_by_runtime,
+    sources: [],
+    rows: [],
+  });
+
+  test("lists each runtime in the site column order, not the report storage order", () => {
+    // the report stores deno-first; the tables read node-first, and a disclosure
+    // listing runtimes in a different order than the columns invites misreading
+    const derived = derive_unavailable_by_runtime(
+      report([
+        { runtime: "bun", rows: ["biome-wasm", "oxc-parser-wasm"] },
+        { runtime: "node", rows: ["biome-wasm"] },
+      ]),
+    );
+    assert.deepStrictEqual(
+      derived.map((entry) => entry.runtime),
+      ["node", "bun"],
+    );
+  });
+
+  test("an empty row list is not a disclosure", () => {
+    assert.isEmpty(
+      derive_unavailable_by_runtime(report([{ runtime: "bun", rows: [] }])),
+    );
+  });
+
+  test("a report predating the field discloses nothing — silence, not an all-clear", () => {
+    assert.isEmpty(derive_unavailable_by_runtime(report(undefined)));
+  });
+
+  test("is_impl_unavailable answers per runtime, and never guesses on an older report", () => {
+    // keyed by ROW name (`biome-wasm`), which is what the tables render — the
+    // bench's init label (`Biome`) would match no cell
+    const recorded = report([{ runtime: "bun", rows: ["biome-wasm"] }]);
+    assert.isTrue(is_impl_unavailable(recorded, "bun", "biome-wasm"));
+    assert.isFalse(is_impl_unavailable(recorded, "node", "biome-wasm"));
+    assert.isFalse(is_impl_unavailable(recorded, "bun", "oxfmt"));
+    // absent field → every cell reads as "not measured here", which is the only
+    // claim the data supports
+    assert.isFalse(is_impl_unavailable(report(undefined), "bun", "biome-wasm"));
+  });
+});
+
+// Binary-size capability grouping. The heuristic reads the tool's NAME, so the
+// tools not named after their job are the ones that can silently land under a
+// heading that misdescribes them (a formatter filed as "parse + format").
+describe("categorize_size_capability", () => {
+  test("reads the job out of a label that names it", () => {
+    assert.strictEqual(categorize_size_capability("tsv parse (ffi)"), "parser");
+    assert.strictEqual(
+      categorize_size_capability("tsv_format_wasm"),
+      "formatter",
+    );
+    assert.strictEqual(categorize_size_capability("oxfmt (napi)"), "formatter");
+    assert.strictEqual(categorize_size_capability(OXC_FULL_LABEL), "full");
+    assert.strictEqual(categorize_size_capability("tsv (napi)"), "full");
+  });
+
+  test("the tools whose names say nothing are stated, not guessed", () => {
+    // each of these would otherwise fall through to `full` — a "parse + format"
+    // heading over four builds, two shipping only a formatter and two no formatter
+    assert.strictEqual(
+      categorize_size_capability("dprint (wasm)"),
+      "formatter",
+    );
+    assert.strictEqual(categorize_size_capability("malva (wasm)"), "formatter");
+    assert.strictEqual(categorize_size_capability("swc (napi)"), "parser");
+    assert.strictEqual(
+      categorize_size_capability("rsvelte compiler (napi)"),
+      "parser",
+    );
+  });
+
+  test("the two dprint plugins share a bucket", () => {
+    // `dprint (wasm)` and `malva (wasm)` are the same kind of artifact — plugins
+    // over the one @dprint/formatter host, neither exposing a parser — so they
+    // must never be filed apart. Only `malva` reads as a formatter to a human
+    // eye, which is exactly how `dprint` sat under "parse + format" alone.
+    assert.strictEqual(
+      categorize_size_capability("dprint (wasm)"),
+      categorize_size_capability("malva (wasm)"),
+    );
+  });
+});
+
+// The per-row file-set-mismatch annotation (the site rendering of the composer's
+// `⚠ files a/b/c`), on a synthetic report since the committed one is healthy.
+describe("derive_cross_runtime_groups files_iterated_mismatch", () => {
+  const report = (
+    files_iterated: CrossRuntimeReport["rows"][number]["files_iterated"],
+  ): CrossRuntimeReport => ({
+    version: 7,
+    kind: "combined",
+    generated: "2026-01-01T00:00:00.000Z",
+    runtimes: ["deno", "node", "bun"],
+    sources: [],
+    rows: [
+      {
+        group: "parse/typescript",
+        name: "tsv-json",
+        ops_per_second: { deno: 1, node: 2, bun: 3 },
+        mean_ns: { deno: 3, node: 2, bun: 1 },
+        files_iterated,
+      },
+    ],
+  });
+
+  const derive_row = (
+    files_iterated: CrossRuntimeReport["rows"][number]["files_iterated"],
+  ) => derive_cross_runtime_groups(report(files_iterated))[0]!.rows[0]!;
+
+  test("equal counts across runtimes derive null", () => {
+    assert.isNull(
+      derive_row({ deno: 767, node: 767, bun: 767 }).files_iterated_mismatch,
+    );
+  });
+
+  test("unequal counts surface the raw per-runtime counts", () => {
+    const mismatch = { deno: 765, node: 767, bun: 767 };
+    assert.deepStrictEqual(
+      derive_row(mismatch).files_iterated_mismatch,
+      mismatch,
+    );
+  });
+
+  test("a null count (untimed runtime) is not a mismatch by itself", () => {
+    assert.isNull(
+      derive_row({ deno: null, node: 767, bun: 767 }).files_iterated_mismatch,
+    );
+  });
+});
+
+// Shape gate for the CLI report `benchmarks_cli.ts` derives from the generated
+// `benchmarks_formatters.json`. The generator parses prose, so a drifted heading
+// or scenario id in the harness's README would silently drop a scenario or its
+// `tsv` reference row and render an empty table rather than fail to typecheck.
+describe("benchmarks_cli shape", () => {
+  test("every scenario the page has prose for resolved to generated data", () => {
+    // a copy entry with no matching scenario id drops silently from the table, so
+    // every required entry must resolve; optional entries (prose staged ahead of
+    // the harness publishing the scenario) may be absent but never misordered
+    const rendered = benchmarks_cli.scenarios.map((s) => s.key);
+    assert.deepEqual(
+      rendered,
+      CLI_SCENARIO_KEYS.filter((key) => rendered.includes(key)),
+    );
+    for (const key of CLI_SCENARIO_KEYS) {
+      if (CLI_OPTIONAL_SCENARIO_KEYS.includes(key)) continue;
+      assert.ok(
+        rendered.includes(key),
+        `scenario copy for "${key}" resolved no generated data`,
+      );
+    }
+    // an optional key must still name a real copy entry, or it guards nothing
+    for (const key of CLI_OPTIONAL_SCENARIO_KEYS) {
+      assert.ok(
+        CLI_SCENARIO_KEYS.includes(key),
+        `optional key "${key}" has no copy entry`,
+      );
+    }
+  });
+
+  test("the renamed TypeScript-repo scenario retires its legacy id", () => {
+    // the harness renamed this scenario, and both ids are carried while its README
+    // still publishes the old one. the moment a regenerated README resolves the
+    // key to the new id, this fails — so the transitional entry is deleted then,
+    // rather than outliving the migration as a comment nobody rereads
+    if (CLI_TS_REPO_KEY === CLI_TS_REPO_KEY_LEGACY) return;
+    assert.ok(
+      !CLI_SCENARIO_KEYS.includes(CLI_TS_REPO_KEY_LEGACY),
+      `the generated data now uses "${CLI_TS_REPO_KEY}", so delete CLI_TS_REPO_KEY_LEGACY along with its SCENARIO_COPY and CLI_OPTIONAL_SCENARIO_KEYS entries`,
+    );
+  });
+
+  test("every scenario carries a tsv reference row with positive metrics", () => {
+    assert.isAtLeast(benchmarks_cli.scenarios.length, 1);
+    for (const scenario of benchmarks_cli.scenarios) {
+      // BenchmarksCli anchors every ratio on the tsv row; without it the table is empty
+      assert.ok(
+        scenario.results.some((r) => r.label === "tsv"),
+        `${scenario.key} is missing its tsv row`,
+      );
+      for (const r of scenario.results) {
+        assert.isAbove(r.wall_ms, 0, `${scenario.key}/${r.label} wall_ms`);
+        assert.isAbove(r.cpu_ms, 0, `${scenario.key}/${r.label} cpu_ms`);
+        // null is legal (a harness run without GNU time measures no memory), 0 is not
+        assert.ok(
+          r.memory_mb === null || r.memory_mb > 0,
+          `${scenario.key}/${r.label} memory_mb`,
+        );
+      }
+    }
+  });
+
+  test("the derived wall-clock ratios agree with hyperfine own summary", () => {
+    // The generated report carries the harness's own `Summary` ratios beside the
+    // raw timings. Recomputing them from the timings and comparing catches a
+    // misparse that would otherwise render plausible-but-wrong numbers.
+    for (const scenario of benchmarks_formatters_json.scenarios) {
+      assert.strictEqual(scenario.baseline, "tsv", `${scenario.id} baseline`);
+      for (const speedup of scenario.speedups) {
+        const derived = cli_speedup_vs_tsv(
+          scenario.id,
+          CLI_LABELS[speedup.name] ?? speedup.name,
+          "wall_ms",
+        );
+        assert.isDefined(derived, `${scenario.id}/${speedup.name}`);
+        // hyperfine derives its summary from full-precision means but prints the
+        // timings rounded, so recomputing from the printed numbers lands within a
+        // fraction of a percent — wide enough for that, far too tight to hide a
+        // misparse (a wrong unit would be off by 1000x)
+        assert.closeTo(
+          derived,
+          speedup.ratio,
+          speedup.ratio * 0.01,
+          `${scenario.id}/${speedup.name}`,
+        );
+      }
+    }
+  });
+
+  test("every formatter accepts the whole corpus, as the page claims", () => {
+    // The page's notes say the preflight parse check found nothing rejected, so
+    // no formatter is credited for skipping files. That's a claim about the data.
+    for (const scenario of benchmarks_formatters_json.scenarios) {
+      assert.isNotEmpty(scenario.preflight, `${scenario.id} ran no preflight`);
+      for (const entry of scenario.preflight) {
+        assert.strictEqual(
+          entry.rejected,
+          0,
+          `${scenario.id}/${entry.name} rejected files`,
+        );
+        assert.isFalse(
+          entry.unavailable,
+          `${scenario.id}/${entry.name} never launched`,
+        );
+      }
+    }
+  });
+});
+
+// The page's prose quotes ratios computed from the reports rather than
+// hand-written numbers, so a renamed entry or a dropped scenario would render
+// `—` mid-sentence instead of failing. These gate every pair the copy names.
+describe("prose ratios resolve", () => {
+  const IN_PROCESS_PAIRS: Array<[string, string, string]> = [
+    ["format/typescript", "oxfmt", "tsv"],
+    ["format/typescript", "prettier", "tsv"],
+    ["format/typescript", "biome-wasm", "tsv_wasm"],
+    ["format/svelte", "prettier", "tsv"],
+    ["format/svelte", "biome-wasm", "tsv_wasm"],
+    ["format/css", "oxfmt", "tsv"],
+    ["format/css", "biome-wasm", "tsv_wasm"],
+    ["parse/typescript", "oxc-parser", "tsv-json-no-locations"],
+  ];
+
+  test("every in-process pair the TLDR quotes is present and favors tsv", () => {
+    for (const [group, slower, faster] of IN_PROCESS_PAIRS) {
+      const ratio = benchmark_speedup(benchmarks_json, group, slower, faster);
+      assert.isDefined(ratio, `${group}: ${slower} vs ${faster}`);
+      assert.isAbove(ratio, 1, `${group}: ${slower} vs ${faster}`);
+    }
+  });
+
+  test("every CLI ratio the prose quotes is present", () => {
+    for (const [label, metric] of [
+      ["oxfmt", "wall_ms"],
+      ["oxfmt", "cpu_ms"],
+      ["biome", "wall_ms"],
+    ] as const) {
+      assert.isDefined(
+        cli_speedup_vs_tsv(CLI_TS_REPO_KEY, label, metric),
+        `${CLI_TS_REPO_KEY}: ${label} ${metric}`,
+      );
+    }
+    // the TLDR's "less memory than either" range, scoped to the tools it names
+    assert.isDefined(
+      cli_memory_ratio_range(CLI_TS_REPO_KEY, ["oxfmt", "biome"]),
+    );
+    assert.isDefined(cli_memory_ratio_range());
+  });
+
+  test("the corpus repos the TLDR names are present", () => {
+    // "including Svelte's official repos (svelte, kit, svelte.dev) and the
+    // fuz.dev repos" — gate the names so the sentence can't outlive the corpus
+    const slugs = new Set(
+      (benchmarks_json.corpus_sources ?? [])
+        .map((s) => s.repo?.slug)
+        .filter(Boolean),
+    );
+    for (const slug of [
+      "sveltejs/svelte",
+      "sveltejs/kit",
+      "sveltejs/svelte.dev",
+    ]) {
+      assert.ok(slugs.has(slug), `TLDR names ${slug} but the corpus lacks it`);
+    }
+    assert.ok(
+      [...slugs].some((slug) => slug?.startsWith("fuzdev/")),
+      "TLDR names the fuz.dev repos but the corpus has none",
+    );
+  });
+
+  test("approximate formatting drops digits as the ratio grows", () => {
+    assert.strictEqual(format_ratio_approx(1.66), "1.7x");
+    assert.strictEqual(format_ratio_approx(26.241), "26x");
+    assert.strictEqual(format_ratio_approx(undefined), "—");
+    // floored at both ends so the claim never overstates either bound
+    assert.strictEqual(format_ratio_range(3.001, 9.89), "3–9x");
+    // the approx variant brackets instead (floor min, ceil max), for ranges
+    // flooring both would collapse — the stated range always contains the truth
+    assert.strictEqual(format_ratio_range_approx(4.48, 4.86), "4–5x");
+    // floor keeps the "at least" end honest where nearest-integer would inflate it
+    assert.strictEqual(format_ratio_range_approx(4.6, 4.86), "4–5x");
+    assert.strictEqual(format_ratio_range_approx(3.001, 9.89), "3–10x");
+  });
 });
diff --git a/src/test/formatter_benchmark_data.test.ts b/src/test/formatter_benchmark_data.test.ts
new file mode 100644
index 0000000..b85563a
--- /dev/null
+++ b/src/test/formatter_benchmark_data.test.ts
@@ -0,0 +1,248 @@
+import { assert, describe, test } from "vitest";
+
+import { parse_formatter_benchmarks } from "$routes/docs/benchmarks/formatter_benchmark_data.ts";
+
+// A trimmed stand-in for the bench harness's README — one scenario tsv runs in,
+// one it sits out, plus the versions and machine lines below the results block.
+const readme = `# Benchmark
+
+<!-- BENCHMARK_RESULTS_START -->
+
+\`\`\`
+=========================================
+Benchmarking Large Single File
+=========================================
+
+Target: TypeScript compiler parser.ts (~540KB)
+- 2 warmup runs, 5 benchmark runs
+- Copy original before each run
+
+
+Preflight (per-formatter parse check):
+  biome: clean
+  oxfmt: 3 rejected
+  tsv: unavailable (command failed to launch)
+Benchmark 1: biome
+  Time (mean ± σ):      1.597 s ±  0.015 s    [User: 1.583 s, System: 0.846 s]
+  Range (min … max):    1.581 s …  1.614 s    5 runs
+
+Benchmark 2: tsv
+  Time (mean ± σ):     28.8 ms ±   0.7 ms    [User: 15.2 ms, System: 13.5 ms]
+  Range (min … max):    27.8 ms …  29.5 ms    5 runs
+
+Summary
+  tsv ran
+   55.41 ± 1.36 times faster than biome
+
+Memory Usage:
+  biome: 303.2 MB (min: 291.5 MB, max: 319.4 MB, 13.12 ± 0.62 times more than tsv)
+  tsv: 23.1 MB (min: 22.5 MB, max: 23.9 MB)
+
+Large single file benchmark complete!
+
+
+=========================================
+Benchmarking Mixed (embedded)
+=========================================
+
+Target: Storybook repository (mixed with embedded languages)
+- 1 warmup runs, 3 benchmark runs
+- Git reset before each run
+
+Benchmark 1: oxfmt
+  Time (mean ± σ):      7.832 s ±  0.209 s    [User: 82.370 s, System: 5.801 s]
+  Range (min … max):    7.622 s …  8.040 s    3 runs
+
+Mixed (embedded) benchmark complete!
+
+
+=========================================
+Benchmarking Svelte (tsv vs rsvelte-fmt)
+=========================================
+
+Target: third-party .svelte corpus (kit, svelte.dev, layerchart)
+- 2 warmup runs, 5 benchmark runs
+- Git reset before each run
+- .svelte only: the two Svelte-native formatters head-to-head
+
+
+Preflight (per-formatter parse check):
+  tsv: clean
+  rsvelte-fmt: CRASHED during check (exit 134)
+  → rsvelte-fmt crashed partway through its check — its coverage is unknown and its timed runs may crash too
+Benchmark 1: tsv
+  Time (mean ± σ):      52.3 ms ±   1.1 ms    [User: 255.0 ms, System: 194.2 ms]
+  Range (min … max):    50.9 ms …  53.6 ms    5 runs
+
+Benchmark 2: rsvelte-fmt
+  Time (mean ± σ):     272.9 ms ±   3.9 ms    [User: 1016.7 ms, System: 408.5 ms]
+  Range (min … max):   268.1 ms … 277.6 ms    5 runs
+
+Summary
+  tsv ran
+    5.22 ± 0.13 times faster than rsvelte-fmt
+
+Memory Usage:
+  tsv: 19.0 MB (min: 18.6 MB, max: 19.4 MB)
+  rsvelte-fmt: 61.1 MB (min: 60.2 MB, max: 62.0 MB, 3.22 ± 0.08 times more than tsv)
+
+Svelte benchmark complete!
+\`\`\`
+
+<!-- BENCHMARK_RESULTS_END -->
+
+## Versions
+
+- **Prettier**: 3.9.1
+- **Biome**: 2.5.1
+- **rsvelte-fmt**: 0.7.4
+- **tsv**: 0.2.0
+
+_Measured on: Some CPU · 12 threads · linux x64 — the ratios below depend on the core count._
+`;
+
+describe("parse_formatter_benchmarks", () => {
+  test("keeps only the scenarios tsv runs in", () => {
+    const parsed = parse_formatter_benchmarks(readme);
+    assert.deepEqual(
+      parsed.scenarios.map((s) => s.id),
+      ["large-single-file", "svelte-tsv-vs-rsvelte-fmt"],
+    );
+  });
+
+  test("parses the machine and versions from below the results block", () => {
+    const parsed = parse_formatter_benchmarks(readme);
+    assert.equal(parsed.machine, "Some CPU · 12 threads · linux x64");
+    assert.deepEqual(parsed.versions, {
+      prettier: "3.9.1",
+      biome: "2.5.1",
+      "rsvelte-fmt": "0.7.4",
+      tsv: "0.2.0",
+    });
+  });
+
+  test("normalizes timings to milliseconds across units", () => {
+    const parsed = parse_formatter_benchmarks(readme);
+    const [biome, tsv] = parsed.scenarios[0]!.timings;
+    assert.deepEqual(biome, {
+      name: "biome",
+      mean_ms: 1597,
+      stddev_ms: 15,
+      user_ms: 1583,
+      system_ms: 846,
+      min_ms: 1581,
+      max_ms: 1614,
+    });
+    assert.equal(tsv!.mean_ms, 28.8);
+  });
+
+  test("parses the scenario header, preflight, speedups, and memory", () => {
+    const scenario = parse_formatter_benchmarks(readme).scenarios[0]!;
+    assert.equal(scenario.name, "Large Single File");
+    assert.equal(scenario.target, "TypeScript compiler parser.ts (~540KB)");
+    assert.equal(scenario.warmup_runs, 2);
+    assert.equal(scenario.benchmark_runs, 5);
+    assert.deepEqual(scenario.preflight, [
+      { name: "biome", rejected: 0, unavailable: false, crashed: false },
+      { name: "oxfmt", rejected: 3, unavailable: false, crashed: false },
+      { name: "tsv", rejected: 0, unavailable: true, crashed: false },
+    ]);
+    assert.equal(scenario.baseline, "tsv");
+    assert.deepEqual(scenario.speedups, [
+      { name: "biome", ratio: 55.41, ratio_stddev: 1.36 },
+    ]);
+    // the lowest-memory formatter is the ratio baseline, so it carries no ratio
+    assert.deepEqual(scenario.memory, [
+      {
+        name: "biome",
+        mean_mb: 303.2,
+        min_mb: 291.5,
+        max_mb: 319.4,
+        ratio: 13.12,
+        ratio_stddev: 0.62,
+      },
+      { name: "tsv", mean_mb: 23.1, min_mb: 22.5, max_mb: 23.9 },
+    ]);
+  });
+
+  test("parses a two-formatter scenario with a crashed preflight row", () => {
+    const scenario = parse_formatter_benchmarks(readme).scenarios[1]!;
+    assert.equal(scenario.name, "Svelte (tsv vs rsvelte-fmt)");
+    assert.deepEqual(scenario.preflight, [
+      { name: "tsv", rejected: 0, unavailable: false, crashed: false },
+      { name: "rsvelte-fmt", rejected: 0, unavailable: false, crashed: true },
+    ]);
+    assert.deepEqual(
+      scenario.timings.map((t) => t.name),
+      ["tsv", "rsvelte-fmt"],
+    );
+    assert.equal(scenario.baseline, "tsv");
+    assert.deepEqual(scenario.speedups, [
+      { name: "rsvelte-fmt", ratio: 5.22, ratio_stddev: 0.13 },
+    ]);
+    // tsv is the memory baseline here, so the ratio sits on the rsvelte-fmt row
+    assert.deepEqual(scenario.memory, [
+      { name: "tsv", mean_mb: 19, min_mb: 18.6, max_mb: 19.4 },
+      {
+        name: "rsvelte-fmt",
+        mean_mb: 61.1,
+        min_mb: 60.2,
+        max_mb: 62,
+        ratio: 3.22,
+        ratio_stddev: 0.08,
+      },
+    ]);
+  });
+
+  // A README that's present but drifted must fail the gen task rather than quietly
+  // publishing stale or scenario-stripped numbers — only a MISSING readme is benign,
+  // and that's the caller's call, not the parser's.
+  test("throws when the results markers are missing", () => {
+    assert.throws(
+      () => parse_formatter_benchmarks("# Benchmark\n\nno results here\n"),
+      /no <!-- BENCHMARK_RESULTS_START/,
+    );
+  });
+
+  test("throws when no scenario includes tsv", () => {
+    const without_tsv = readme.replace(
+      /^Benchmark (\d+): tsv$/gm,
+      "Benchmark $1: oxfmt",
+    );
+    assert.throws(
+      () => parse_formatter_benchmarks(without_tsv),
+      /no scenario includes a tsv row/,
+    );
+  });
+
+  test("throws when a scenario banner carries no parseable timings", () => {
+    const drifted = readme.replace(/^Benchmark \d+: /gm, "Bench $&");
+    assert.throws(
+      () => parse_formatter_benchmarks(drifted),
+      /no parseable timings/,
+    );
+  });
+
+  test("throws when a present memory section yields no rows", () => {
+    const drifted = readme
+      .replace(/^ {2}biome: 303\.2 MB.*$/m, "  biome: 303.2 megabytes")
+      .replace(/^ {2}tsv: 23\.1 MB.*$/m, "  tsv: 23.1 megabytes");
+    assert.throws(
+      () => parse_formatter_benchmarks(drifted),
+      /unparseable memory section/,
+    );
+  });
+
+  test("throws when the machine line or tsv version is missing", () => {
+    assert.throws(
+      () =>
+        parse_formatter_benchmarks(readme.replace(/^_Measured on: .*$/m, "")),
+      /machine line/,
+    );
+    assert.throws(
+      () =>
+        parse_formatter_benchmarks(readme.replace(/^- \*\*tsv\*\*: .*$/m, "")),
+      /no tsv version/,
+    );
+  });
+});
diff --git a/svelte.config.js b/svelte.config.js
index 1fd7b37..37118d6 100644
--- a/svelte.config.js
+++ b/svelte.config.js
@@ -1,21 +1,27 @@
-import {vitePreprocess} from '@sveltejs/vite-plugin-svelte';
-import adapter from '@sveltejs/adapter-static';
-import {svelte_preprocess_mdz} from '@fuzdev/mdz/svelte_preprocess_mdz.js';
-import {svelte_preprocess_fuz_code} from '@fuzdev/fuz_code/svelte_preprocess_fuz_code.js';
-import {create_csp_directives} from '@fuzdev/fuz_ui/csp.js';
-import {csp_directives_of_fuzdev} from '@fuzdev/fuz_ui/csp_of_fuzdev.js';
-import {execSync} from 'node:child_process';
+import { vitePreprocess } from "@sveltejs/vite-plugin-svelte";
+import adapter from "@sveltejs/adapter-static";
+import { svelte_preprocess_mdz } from "@fuzdev/mdz/svelte_preprocess_mdz.js";
+import { svelte_preprocess_fuz_code } from "@fuzdev/fuz_code/svelte_preprocess_fuz_code.js";
+import { create_csp_directives } from "@fuzdev/fuz_ui/csp.js";
+import { csp_directives_of_fuzdev } from "@fuzdev/fuz_ui/csp_of_fuzdev.js";
+import { execSync } from "node:child_process";
 
 /** @type {import('@sveltejs/kit').Config} */
 export default {
-	preprocess: [svelte_preprocess_mdz(), svelte_preprocess_fuz_code(), vitePreprocess()],
-	compilerOptions: {runes: true},
-	vitePlugin: {inspector: true},
-	kit: {
-		adapter: adapter(),
-		paths: {relative: false}, // use root-absolute paths for SSR path comparison: https://svelte.dev/docs/kit/configuration#paths
-		alias: {$routes: 'src/routes'},
-		version: {name: execSync('git rev-parse HEAD').toString().trim()},
-		csp: {directives: create_csp_directives({extend: [csp_directives_of_fuzdev]})},
-	},
+  preprocess: [
+    svelte_preprocess_mdz(),
+    svelte_preprocess_fuz_code(),
+    vitePreprocess(),
+  ],
+  compilerOptions: { runes: true },
+  vitePlugin: { inspector: true },
+  kit: {
+    adapter: adapter(),
+    paths: { relative: false }, // use root-absolute paths for SSR path comparison: https://svelte.dev/docs/kit/configuration#paths
+    alias: { $routes: "src/routes" },
+    version: { name: execSync("git rev-parse HEAD").toString().trim() },
+    csp: {
+      directives: create_csp_directives({ extend: [csp_directives_of_fuzdev] }),
+    },
+  },
 };
diff --git a/tsconfig.json b/tsconfig.json
index 0300902..123031d 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,40 +1,40 @@
 {
-	"extends": "./.svelte-kit/tsconfig.json",
-	"compilerOptions": {
-		"types": ["@sveltejs/kit"],
-		"module": "nodenext",
-		"moduleResolution": "nodenext",
-		"strict": true,
-		"useUnknownInCatchVariables": false,
-		"exactOptionalPropertyTypes": false,
-		"forceConsistentCasingInFileNames": true,
-		"noUnusedLocals": true,
-		"noUnusedParameters": true,
-		"noImplicitReturns": true,
-		"noImplicitOverride": true,
-		"noFallthroughCasesInSwitch": true,
-		"noUncheckedIndexedAccess": true,
-		"resolveJsonModule": true,
-		"sourceMap": true,
-		"declaration": true,
-		"declarationMap": true,
-		"sourceRoot": "../src/lib/",
-		"importHelpers": true,
-		"skipLibCheck": true,
-		"allowJs": true,
-		"checkJs": true,
-		"erasableSyntaxOnly": true,
-		"allowImportingTsExtensions": true,
-		"rewriteRelativeImportExtensions": false
-	},
-	"include": [
-		"*.js",
-		"*.ts",
-		".svelte-kit/ambient.d.ts",
-		".svelte-kit/non-ambient.d.ts",
-		".svelte-kit/types/**/$types.d.ts",
-		"src/**/*.js",
-		"src/**/*.ts",
-		"src/**/*.svelte"
-	]
+  "extends": "./.svelte-kit/tsconfig.json",
+  "compilerOptions": {
+    "types": ["@sveltejs/kit"],
+    "module": "nodenext",
+    "moduleResolution": "nodenext",
+    "strict": true,
+    "useUnknownInCatchVariables": false,
+    "exactOptionalPropertyTypes": false,
+    "forceConsistentCasingInFileNames": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noImplicitReturns": true,
+    "noImplicitOverride": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedIndexedAccess": true,
+    "resolveJsonModule": true,
+    "sourceMap": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceRoot": "../src/lib/",
+    "importHelpers": true,
+    "skipLibCheck": true,
+    "allowJs": true,
+    "checkJs": true,
+    "erasableSyntaxOnly": true,
+    "allowImportingTsExtensions": true,
+    "rewriteRelativeImportExtensions": false
+  },
+  "include": [
+    "*.js",
+    "*.ts",
+    ".svelte-kit/ambient.d.ts",
+    ".svelte-kit/non-ambient.d.ts",
+    ".svelte-kit/types/**/$types.d.ts",
+    "src/**/*.js",
+    "src/**/*.ts",
+    "src/**/*.svelte"
+  ]
 }
diff --git a/vite.config.ts b/vite.config.ts
index 677e6eb..ee4d307 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -1,10 +1,15 @@
-import {defineConfig} from 'vite';
-import {sveltekit} from '@sveltejs/kit/vite';
-import {vite_plugin_fuz_css} from '@fuzdev/fuz_css/vite_plugin_fuz_css.ts';
-import svelte_docinfo from 'svelte-docinfo/vite.js';
-import {vite_plugin_pkg_json} from '@fuzdev/fuz_ui/vite_plugin_pkg_json.ts';
+import { defineConfig } from "vite";
+import { sveltekit } from "@sveltejs/kit/vite";
+import { vite_plugin_fuz_css } from "@fuzdev/fuz_css/vite_plugin_fuz_css.ts";
+import svelte_docinfo from "svelte-docinfo/vite.js";
+import { vite_plugin_pkg_json } from "@fuzdev/fuz_ui/vite_plugin_pkg_json.ts";
 
 export default defineConfig({
-	plugins: [sveltekit(), svelte_docinfo(), vite_plugin_fuz_css(), vite_plugin_pkg_json()],
-	optimizeDeps: {exclude: ['@fuzdev/blake3_wasm', '@fuzdev/tsv_wasm']},
+  plugins: [
+    sveltekit(),
+    svelte_docinfo(),
+    vite_plugin_fuz_css(),
+    vite_plugin_pkg_json(),
+  ],
+  optimizeDeps: { exclude: ["@fuzdev/blake3_wasm", "@fuzdev/tsv_wasm"] },
 });