diff --git a/CHANGELOG.md b/CHANGELOG.md
index c0f87ad..5099fc2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,9 @@
 
 ### Changes
 
+- Utils: The tailwind/trash class checks are now named predicates (`isTailwindClass`, `isTrashClass`) shared
+  by the HTML snapshots and the diff's container-class filter, replacing three copies of the same inline
+  lambda.
 - Config: `dynamicPageRegex` now extends the built-in dynamic-segment heuristics (numeric, UUID,
   ULID, hex) instead of replacing them. Previously, setting a custom pattern silently disabled
   every built-in match on any segment the custom pattern didn't also cover.
diff --git a/src/utils/html-diff.ts b/src/utils/html-diff.ts
index 591741a..9295bb3 100644
--- a/src/utils/html-diff.ts
+++ b/src/utils/html-diff.ts
@@ -1,7 +1,7 @@
 import { parse, serialize } from 'parse5';
 import type * as parse5TreeAdapter from 'parse5/lib/tree-adapters/default';
 import type { HtmlConfig } from '../config.ts';
-import { TAILWIND_CLASS_PATTERNS, TRASH_HTML_CLASSES, minifyHtml } from './html.ts';
+import { isTailwindClass, isTrashClass, minifyHtml } from './html.ts';
 import { isDynamicId, isGenericClass } from './xpath.ts';
 
 export interface HtmlDiffPart {
@@ -467,15 +467,13 @@ const directTextDiffer = (current: ElementNode, previous: ElementNode): boolean
   return false;
 };
 
-const trashHtmlClasses = TRASH_HTML_CLASSES;
-
 function filterContainerClasses(classes: string[]): string[] {
   return classes
     .filter((cls) => !/\d/.test(cls))
     .filter((cls) => !isGenericClass(cls))
-    .filter((cls) => !trashHtmlClasses.test(cls))
+    .filter((cls) => !isTrashClass(cls))
     .filter((cls) => !/(:|__)/.test(cls))
-    .filter((cls) => !TAILWIND_CLASS_PATTERNS.some((pattern) => pattern.test(cls)));
+    .filter((cls) => !isTailwindClass(cls));
 }
 
 function buildContainerSelector(element: ElementNode, allElements: NodeMap): string | null {
diff --git a/src/utils/html.ts b/src/utils/html.ts
index 0e45748..f7ed9a4 100644
--- a/src/utils/html.ts
+++ b/src/utils/html.ts
@@ -544,6 +544,9 @@ export const TAILWIND_CLASS_PATTERNS: RegExp[] = [
   /^prose$/i,
 ];
 
+export const isTailwindClass = (cls: string): boolean => TAILWIND_CLASS_PATTERNS.some((pattern) => pattern.test(cls));
+export const isTrashClass = (cls: string): boolean => TRASH_HTML_CLASSES.test(cls);
+
 const NON_SEMANTIC_TAGS = new Set([
   'style',
   'script',
@@ -758,7 +761,6 @@ export function sanitizeHtmlString(html: string, htmlConfig?: HtmlConfig): strin
  */
 export function htmlMinimalUISnapshot(html: string, htmlConfig?: HtmlConfig['minimal']) {
   const document = parse(html);
-  const trashHtmlClasses = TRASH_HTML_CLASSES;
   const removeElements = ['path', 'script'];
 
   function isFilteredOut(node) {
@@ -867,9 +869,9 @@ export function htmlMinimalUISnapshot(html: string, htmlConfig?: HtmlConfig['min
           attr.value = value
             .split(' ')
             .filter((className) => !/\d/.test(className))
-            .filter((className) => !className.match(trashHtmlClasses))
+            .filter((className) => !isTrashClass(className))
             .filter((className) => !className.match(/(:|__)/))
-            .filter((className) => !TAILWIND_CLASS_PATTERNS.some((pattern) => pattern.test(className)))
+            .filter((className) => !isTailwindClass(className))
             .join(' ');
           if (attr.value === '') return false;
         }
@@ -1451,7 +1453,7 @@ function cleanElement(element: parse5TreeAdapter.Element): void {
         .filter(Boolean)
         .filter((className) => !/\d/.test(className))
         .filter((className) => !className.includes(':'))
-        .filter((className) => !TAILWIND_CLASS_PATTERNS.some((pattern) => pattern.test(className)))
+        .filter((className) => !isTailwindClass(className))
         .join(' ');
 
       if (!attr.value) {