From 13ae5c349dfa14a48f03a0a17cd906648baf4b9e Mon Sep 17 00:00:00 2001
From: TrevorSundberg <Trevor.Sundberg@gmail.com>
Date: Tue, 28 Apr 2026 18:18:50 -0700
Subject: [PATCH] Fix ParentNode insertBefore links

---
 packages/polyfill/source/ParentNode.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/polyfill/source/ParentNode.ts b/packages/polyfill/source/ParentNode.ts
index b40d0c34..50e87086 100644
--- a/packages/polyfill/source/ParentNode.ts
+++ b/packages/polyfill/source/ParentNode.ts
@@ -124,6 +124,7 @@ export class ParentNode extends ChildNode {
       child[NEXT] = before;
       child[PREV] = before[PREV];
       if (before[PREV] === null) this[CHILD] = child;
+      else before[PREV][NEXT] = child;
       before[PREV] = child;
     } else {
       child[NEXT] = null;