From 01a52e2300779ed411f9db3bc039656bac1d4699 Mon Sep 17 00:00:00 2001
From: Philip Pesca <ppesca@ucsd.edu>
Date: Wed, 24 Jul 2019 10:10:36 -0700
Subject: HTML writer: ensure TeX formulas are rendered correctly (#5658)

The web service passed in to `--webtex` may render formulas using inline
or display style by default. Prefixing formulas with the appropriate
command ensures they are rendered correctly.

This is a followup to the discussion in #5656.
---
 src/Text/Pandoc/Writers/HTML.hs | 2 +-
 test/command/5655.md            | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Text/Pandoc/Writers/HTML.hs b/src/Text/Pandoc/Writers/HTML.hs
index 84fd404b1..5484ebba9 100644
--- a/src/Text/Pandoc/Writers/HTML.hs
+++ b/src/Text/Pandoc/Writers/HTML.hs
@@ -1064,7 +1064,7 @@ inlineToHtml opts inline = do
               let imtag = if html5 then H5.img else H.img
               let s = case t of
                            InlineMath  -> "\\textstyle "
-                           DisplayMath -> ""
+                           DisplayMath -> "\\displaystyle "
               let m = imtag ! A.style "vertical-align:middle"
                             ! A.src (toValue $ url ++ urlEncode (s ++ str))
                             ! A.alt (toValue str)
diff --git a/test/command/5655.md b/test/command/5655.md
index de5a923ae..35987c10a 100644
--- a/test/command/5655.md
+++ b/test/command/5655.md
@@ -9,6 +9,6 @@ $T_n={n+1 \choose 2}$
 % pandoc --webtex
 $$T_n={n+1 \choose 2}$$
 ^D
-<p><br /><img style="vertical-align:middle" src="https://latex.codecogs.com/png.latex?T_n%3D%7Bn%2B1%20%5Cchoose%202%7D" alt="T_n={n+1 \choose 2}" title="T_n={n+1 \choose 2}" /><br /></p>
+<p><br /><img style="vertical-align:middle" src="https://latex.codecogs.com/png.latex?%5Cdisplaystyle%20T_n%3D%7Bn%2B1%20%5Cchoose%202%7D" alt="T_n={n+1 \choose 2}" title="T_n={n+1 \choose 2}" /><br /></p>
 ````
 
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