From 5423a779c1a403377ed1f65e73f7e9dff8191af9 Mon Sep 17 00:00:00 2001
From: YDKK <YDKK@users.noreply.github.com>
Date: Fri, 17 Oct 2025 01:21:54 +0900
Subject: [PATCH] fix(cssnano-preset): disable CSS counter minification
 (#11487)
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Co-authored-by: Sébastien Lorber <slorber@users.noreply.github.com>
---
 packages/docusaurus-cssnano-preset/src/index.ts       | 3 +++
 website/_dogfooding/_pages tests/code-block-tests.mdx | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/packages/docusaurus-cssnano-preset/src/index.ts b/packages/docusaurus-cssnano-preset/src/index.ts
index bdb0a37ad5..c3f4927d9f 100644
--- a/packages/docusaurus-cssnano-preset/src/index.ts
+++ b/packages/docusaurus-cssnano-preset/src/index.ts
@@ -13,6 +13,9 @@ const preset: typeof advancedBasePreset = function preset(opts) {
   const advancedPreset = advancedBasePreset({
     autoprefixer: {add: false},
     discardComments: {removeAll: true},
+    // See CodeBlock custom line number bug: https://github.com/facebook/docusaurus/pull/11487
+    /* cSpell:ignore Idents */
+    reduceIdents: {counter: false},
     /* cSpell:ignore zindex */
     zindex: false,
     ...opts,
diff --git a/website/_dogfooding/_pages tests/code-block-tests.mdx b/website/_dogfooding/_pages tests/code-block-tests.mdx
index dfff4af5a3..69034fdac4 100644
--- a/website/_dogfooding/_pages tests/code-block-tests.mdx	
+++ b/website/_dogfooding/_pages tests/code-block-tests.mdx	
@@ -226,6 +226,13 @@ function PageLayout(props) {
 }
 ```
 
+```jsx showLineNumbers=4
+function PageLayout(props) {
+  // highlight-next-line
+  return <Layout title="Awesome Docusaurus page" description="Test Test Test Test Test Test Test Test Test Test Test Test Test Test ">;
+}
+```
+
 ```jsx {1,3,6} showLineNumbers
 function PageLayout(props) {
   console.log(