From 99614aede3914398f5aa8bf7cd1de3bc7fb8bdc8 Mon Sep 17 00:00:00 2001
From: Seonhyo Choi <cornpip7777@gmail.com>
Date: Wed, 8 Jul 2026 03:45:08 +0900
Subject: [PATCH] fix(math): restore formula overflow scroll for MathJax 4
 (#2770)

Since the MathJax 4 upgrade (97a537e), the `mjx-container` overflow
rules were dropped, so long display equations extend past the viewport
and cause page-level horizontal scrolling on mobile (the fix from #545
for #543 was lost). MathJax 4 defaults to `displayOverflow: 'overflow'`;
set it to 'scroll' so long equations scroll within their own container.
---
 assets/js/data/mathjax.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/assets/js/data/mathjax.js b/assets/js/data/mathjax.js
index ca3d0de52..8a546e63a 100644
--- a/assets/js/data/mathjax.js
+++ b/assets/js/data/mathjax.js
@@ -21,5 +21,9 @@ MathJax = {
     ],
     {%- comment -%} equation numbering {%- endcomment -%}
     tags: 'ams'
+  },
+  output: {
+    {%- comment -%} scroll long display equations instead of overflowing the page {%- endcomment -%}
+    displayOverflow: 'scroll'
   }
 };