From fa0ec573e1bf83192771925e0f5ffcb5d5606739 Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Sun, 20 Sep 2026 05:30:10 +0000
Subject: [PATCH] HTML writer: make KaTeX CSS URL handling consistent with the
 JS URL.

The stylesheet link applied toURI to the base URL before appending
katex.min.css, while the script URL appended before converting.

Co-Authored-By: Claude <noreply@anthropic.com>
---
 src/Text/Pandoc/Writers/HTML.hs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Text/Pandoc/Writers/HTML.hs b/src/Text/Pandoc/Writers/HTML.hs
index 9fec8ba61..41debb62a 100644
--- a/src/Text/Pandoc/Writers/HTML.hs
+++ b/src/Text/Pandoc/Writers/HTML.hs
@@ -360,7 +360,7 @@ pandocToHtml opts (Pandoc meta blocks) = do
             ]
           nl
           H.link ! A.rel "stylesheet" !
-            A.href (toValue $ toURI html5 url <> "katex.min.css")
+            A.href (toValue $ toURI html5 $ url <> "katex.min.css")
 
         _ -> mempty
   let mCss :: Maybe [Text] = lookupContext "css" metadata