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branch master updated: * tp/Texinfo/Convert/HTML.pm (%css_element_class_


From: Patrice Dumas
Subject: branch master updated: * tp/Texinfo/Convert/HTML.pm (%css_element_class_styles) <displaymath>: center displaymath. Report and CSS from Rudolf Adamkovič.
Date: Fri, 06 Sep 2024 05:21:02 -0400

This is an automated email from the git hooks/post-receive script.

pertusus pushed a commit to branch master
in repository texinfo.

The following commit(s) were added to refs/heads/master by this push:
     new 2ebe7e987f * tp/Texinfo/Convert/HTML.pm (%css_element_class_styles) 
<displaymath>: center displaymath.  Report and CSS from Rudolf Adamkovič.
2ebe7e987f is described below

commit 2ebe7e987f393d3f75f4749c9fda6143a9d5afbc
Author: Patrice Dumas <pertusus@free.fr>
AuthorDate: Fri Sep 6 11:21:01 2024 +0200

    * tp/Texinfo/Convert/HTML.pm (%css_element_class_styles)
    <displaymath>: center displaymath.  Report and CSS from Rudolf
    Adamkovič.
---
 ChangeLog                                          |  6 ++
 tp/Texinfo/Convert/HTML.pm                         |  4 +-
 tp/t/results/html_tests/mathjax_with_texinfo.pl    |  2 +-
 .../mathjax_with_texinfo_enable_encoding.pl        |  2 +-
 .../res_html/index.html                            |  2 +-
 .../mathjax_with_texinfo_no_convert_to_latex.pl    |  2 +-
 tp/t/results/raw/displaymath.pl                    |  2 +-
 .../res_parser/formatting_chm/chapter.html         |  2 +-
 .../res_parser/formatting_chm/formatting.html      |  2 +-
 .../EPUB/xhtml/chapter.xhtml                       |  2 +-
 .../EPUB/xhtml/formatting.xhtml                    |  2 +-
 .../formatting_html_no_split/formatting.html       |  2 +-
 .../formatting_regions/formatting_regions.html     |  2 +-
 .../res_parser/formatting_xhtml/formatting.html    |  2 +-
 .../formatting_enable_encoding/formatting.html     |  2 +-
 .../EPUB/xhtml/chapter.xhtml                       |  2 +-
 .../EPUB/xhtml/formatting.xhtml                    |  2 +-
 .../res_parser/formatting_exotic/chapter.html      |  2 +-
 .../res_parser/formatting_fr/formatting.html       |  2 +-
 .../res_parser/formatting_fr_icons/formatting.html |  2 +-
 .../formatting_inline_css/formatting.html          | 90 +++++++++++-----------
 .../res_parser/formatting_mathjax/formatting.html  |  2 +-
 .../formatting_numerical_entities/formatting.html  |  2 +-
 .../formatting_sort_element_counts/formatting.html |  2 +-
 .../formatting_texi2html/formatting.html           |  2 +-
 .../formatting_texi2html_nodes/chapter.html        |  2 +-
 .../formatting_texi2html_nodes/index.html          |  2 +-
 .../formatting_weird_quotes/formatting.html        |  2 +-
 .../res_parser/tex_gdef_mathjax/tex_gdef.html      |  2 +-
 tp/tests/tex_html/res_parser/tex_mathjax/tex.html  |  2 +-
 tp/tests/tex_html/res_parser/tex_notex/tex.html    |  2 +-
 31 files changed, 82 insertions(+), 74 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 8d7ddf15c5..a250119310 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2024-09-06  Patrice Dumas  <pertusus@free.fr>
+
+       * tp/Texinfo/Convert/HTML.pm (%css_element_class_styles)
+       <displaymath>: center displaymath.  Report and CSS from Rudolf
+       Adamkovič.
+
 2024-09-06  Patrice Dumas  <pertusus@free.fr>
 
        * tp/t/init/t2h_singular.init (singular_format_footer): update for
diff --git a/tp/Texinfo/Convert/HTML.pm b/tp/Texinfo/Convert/HTML.pm
index 08972f88a8..5725b353c6 100644
--- a/tp/Texinfo/Convert/HTML.pm
+++ b/tp/Texinfo/Convert/HTML.pm
@@ -2960,7 +2960,9 @@ my %css_element_class_styles = (
      'pre.menu-preformatted'  => 'font-family: serif',
      'a.summary-letter-printindex'  => 'text-decoration: none',
      'pre.display-preformatted'     => 'font-family: inherit',
-     'pre.displaymath'              => 'font-style: italic; font-family: 
serif',
+     # 'display: flex; justify-content: center' centers the pre as a whole
+     'pre.displaymath'
+           => 'font-style: italic; font-family: serif; display: flex; 
justify-content: center',
      'span.program-in-footer' => 'font-size: smaller', # used with 
PROGRAM_NAME_IN_FOOTER
      'span.sansserif'     => 'font-family: sans-serif; font-weight: normal',
      'span.r'             => 'font-family: initial; font-weight: normal; 
font-style: normal',
diff --git a/tp/t/results/html_tests/mathjax_with_texinfo.pl 
b/tp/t/results/html_tests/mathjax_with_texinfo.pl
index 649ebab570..a2aae9e0a6 100644
--- a/tp/t/results/html_tests/mathjax_with_texinfo.pl
+++ b/tp/t/results/html_tests/mathjax_with_texinfo.pl
@@ -269,7 +269,7 @@ $result_converted{'html'}->{'mathjax_with_texinfo'} = 
'<!DOCTYPE html>
 
 <style type="text/css">
 <!--
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 -->
 </style>
 
diff --git a/tp/t/results/html_tests/mathjax_with_texinfo_enable_encoding.pl 
b/tp/t/results/html_tests/mathjax_with_texinfo_enable_encoding.pl
index 2984cd1cea..4643a0e1c5 100644
--- a/tp/t/results/html_tests/mathjax_with_texinfo_enable_encoding.pl
+++ b/tp/t/results/html_tests/mathjax_with_texinfo_enable_encoding.pl
@@ -281,7 +281,7 @@ 
$result_converted{'html'}->{'mathjax_with_texinfo_enable_encoding'} = '<!DOCTYPE
 
 <style type="text/css">
 <!--
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 -->
 </style>
 
diff --git 
a/tp/t/results/html_tests/mathjax_with_texinfo_html_file/res_html/index.html 
b/tp/t/results/html_tests/mathjax_with_texinfo_html_file/res_html/index.html
index 99079b7669..c3cc275f73 100644
--- a/tp/t/results/html_tests/mathjax_with_texinfo_html_file/res_html/index.html
+++ b/tp/t/results/html_tests/mathjax_with_texinfo_html_file/res_html/index.html
@@ -13,7 +13,7 @@
 
 <style type="text/css">
 <!--
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 -->
 </style>
 
diff --git 
a/tp/t/results/html_tests/mathjax_with_texinfo_no_convert_to_latex.pl 
b/tp/t/results/html_tests/mathjax_with_texinfo_no_convert_to_latex.pl
index 4f5be8870c..6a6dd3c20f 100644
--- a/tp/t/results/html_tests/mathjax_with_texinfo_no_convert_to_latex.pl
+++ b/tp/t/results/html_tests/mathjax_with_texinfo_no_convert_to_latex.pl
@@ -269,7 +269,7 @@ 
$result_converted{'html'}->{'mathjax_with_texinfo_no_convert_to_latex'} = '<!DOC
 
 <style type="text/css">
 <!--
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 -->
 </style>
 
diff --git a/tp/t/results/raw/displaymath.pl b/tp/t/results/raw/displaymath.pl
index e59ec17593..9aeb5bd673 100644
--- a/tp/t/results/raw/displaymath.pl
+++ b/tp/t/results/raw/displaymath.pl
@@ -242,7 +242,7 @@ $result_converted{'html'}->{'displaymath'} = '<!DOCTYPE 
html>
 
 <style type="text/css">
 <!--
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 -->
 </style>
 
diff --git a/tp/tests/coverage/res_parser/formatting_chm/chapter.html 
b/tp/tests/coverage/res_parser/formatting_chm/chapter.html
index 42bd87704c..87f324c495 100644
--- a/tp/tests/coverage/res_parser/formatting_chm/chapter.html
+++ b/tp/tests/coverage/res_parser/formatting_chm/chapter.html
@@ -888,7 +888,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 span.r {font-family: initial; font-weight: normal; font-style: normal}
 span.sansserif {font-family: sans-serif; font-weight: normal}
diff --git a/tp/tests/coverage/res_parser/formatting_chm/formatting.html 
b/tp/tests/coverage/res_parser/formatting_chm/formatting.html
index a520a528ab..ce69a689ef 100644
--- a/tp/tests/coverage/res_parser/formatting_chm/formatting.html
+++ b/tp/tests/coverage/res_parser/formatting_chm/formatting.html
@@ -886,7 +886,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 span.r {font-family: initial; font-weight: normal; font-style: normal}
 span.sansserif {font-family: sans-serif; font-weight: normal}
diff --git 
a/tp/tests/coverage/res_parser/formatting_epub/formatting_epub_package/EPUB/xhtml/chapter.xhtml
 
b/tp/tests/coverage/res_parser/formatting_epub/formatting_epub_package/EPUB/xhtml/chapter.xhtml
index 8b3eaca800..3716774754 100644
--- 
a/tp/tests/coverage/res_parser/formatting_epub/formatting_epub_package/EPUB/xhtml/chapter.xhtml
+++ 
b/tp/tests/coverage/res_parser/formatting_epub/formatting_epub_package/EPUB/xhtml/chapter.xhtml
@@ -888,7 +888,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 span.r {font-family: initial; font-weight: normal; font-style: normal}
 span.sansserif {font-family: sans-serif; font-weight: normal}
diff --git 
a/tp/tests/coverage/res_parser/formatting_epub/formatting_epub_package/EPUB/xhtml/formatting.xhtml
 
b/tp/tests/coverage/res_parser/formatting_epub/formatting_epub_package/EPUB/xhtml/formatting.xhtml
index 17d4869f00..af29f461d4 100644
--- 
a/tp/tests/coverage/res_parser/formatting_epub/formatting_epub_package/EPUB/xhtml/formatting.xhtml
+++ 
b/tp/tests/coverage/res_parser/formatting_epub/formatting_epub_package/EPUB/xhtml/formatting.xhtml
@@ -886,7 +886,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 span.r {font-family: initial; font-weight: normal; font-style: normal}
 span.sansserif {font-family: sans-serif; font-weight: normal}
diff --git 
a/tp/tests/coverage/res_parser/formatting_html_no_split/formatting.html 
b/tp/tests/coverage/res_parser/formatting_html_no_split/formatting.html
index 61235b7226..11320c634d 100644
--- a/tp/tests/coverage/res_parser/formatting_html_no_split/formatting.html
+++ b/tp/tests/coverage/res_parser/formatting_html_no_split/formatting.html
@@ -887,7 +887,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 span.r {font-family: initial; font-weight: normal; font-style: normal}
 span.sansserif {font-family: sans-serif; font-weight: normal}
diff --git 
a/tp/tests/coverage/res_parser/formatting_regions/formatting_regions.html 
b/tp/tests/coverage/res_parser/formatting_regions/formatting_regions.html
index b8b8623f7b..b68331dae8 100644
--- a/tp/tests/coverage/res_parser/formatting_regions/formatting_regions.html
+++ b/tp/tests/coverage/res_parser/formatting_regions/formatting_regions.html
@@ -887,7 +887,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 span.r {font-family: initial; font-weight: normal; font-style: normal}
 span.sansserif {font-family: sans-serif; font-weight: normal}
diff --git a/tp/tests/coverage/res_parser/formatting_xhtml/formatting.html 
b/tp/tests/coverage/res_parser/formatting_xhtml/formatting.html
index 2269aab864..c0b7dcc8eb 100644
--- a/tp/tests/coverage/res_parser/formatting_xhtml/formatting.html
+++ b/tp/tests/coverage/res_parser/formatting_xhtml/formatting.html
@@ -889,7 +889,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 span.r {font-family: initial; font-weight: normal; font-style: normal}
 span.sansserif {font-family: sans-serif; font-weight: normal}
diff --git 
a/tp/tests/layout/res_parser/formatting_enable_encoding/formatting.html 
b/tp/tests/layout/res_parser/formatting_enable_encoding/formatting.html
index fef269c5ee..13e13f94d1 100644
--- a/tp/tests/layout/res_parser/formatting_enable_encoding/formatting.html
+++ b/tp/tests/layout/res_parser/formatting_enable_encoding/formatting.html
@@ -889,7 +889,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 pre.menu-comment-preformatted {font-family: serif}
 pre.menu-entry-description-preformatted {font-family: serif; display: inline}
diff --git 
a/tp/tests/layout/res_parser/formatting_epub_nodes/formatting_epub_package/EPUB/xhtml/chapter.xhtml
 
b/tp/tests/layout/res_parser/formatting_epub_nodes/formatting_epub_package/EPUB/xhtml/chapter.xhtml
index 400182ad3a..d25540fa31 100644
--- 
a/tp/tests/layout/res_parser/formatting_epub_nodes/formatting_epub_package/EPUB/xhtml/chapter.xhtml
+++ 
b/tp/tests/layout/res_parser/formatting_epub_nodes/formatting_epub_package/EPUB/xhtml/chapter.xhtml
@@ -888,7 +888,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 span.r {font-family: initial; font-weight: normal; font-style: normal}
 span.sansserif {font-family: sans-serif; font-weight: normal}
diff --git 
a/tp/tests/layout/res_parser/formatting_epub_nodes/formatting_epub_package/EPUB/xhtml/formatting.xhtml
 
b/tp/tests/layout/res_parser/formatting_epub_nodes/formatting_epub_package/EPUB/xhtml/formatting.xhtml
index 0814395e48..1ad9e126c4 100644
--- 
a/tp/tests/layout/res_parser/formatting_epub_nodes/formatting_epub_package/EPUB/xhtml/formatting.xhtml
+++ 
b/tp/tests/layout/res_parser/formatting_epub_nodes/formatting_epub_package/EPUB/xhtml/formatting.xhtml
@@ -886,7 +886,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 span.r {font-family: initial; font-weight: normal; font-style: normal}
 span.sansserif {font-family: sans-serif; font-weight: normal}
diff --git a/tp/tests/layout/res_parser/formatting_exotic/chapter.html 
b/tp/tests/layout/res_parser/formatting_exotic/chapter.html
index 3c782ddde3..57ac778ac8 100644
--- a/tp/tests/layout/res_parser/formatting_exotic/chapter.html
+++ b/tp/tests/layout/res_parser/formatting_exotic/chapter.html
@@ -882,7 +882,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 span.program-in-footer {font-size: smaller}
 span.r {font-family: initial; font-weight: normal; font-style: normal}
diff --git a/tp/tests/layout/res_parser/formatting_fr/formatting.html 
b/tp/tests/layout/res_parser/formatting_fr/formatting.html
index 09bdb96990..c4b12dce9b 100644
--- a/tp/tests/layout/res_parser/formatting_fr/formatting.html
+++ b/tp/tests/layout/res_parser/formatting_fr/formatting.html
@@ -884,7 +884,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 pre.menu-comment-preformatted {font-family: serif}
 pre.menu-entry-description-preformatted {font-family: serif; display: inline}
diff --git a/tp/tests/layout/res_parser/formatting_fr_icons/formatting.html 
b/tp/tests/layout/res_parser/formatting_fr_icons/formatting.html
index 867f7a3d2a..51d0645998 100644
--- a/tp/tests/layout/res_parser/formatting_fr_icons/formatting.html
+++ b/tp/tests/layout/res_parser/formatting_fr_icons/formatting.html
@@ -884,7 +884,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 pre.menu-comment-preformatted {font-family: serif}
 pre.menu-entry-description-preformatted {font-family: serif; display: inline}
diff --git a/tp/tests/layout/res_parser/formatting_inline_css/formatting.html 
b/tp/tests/layout/res_parser/formatting_inline_css/formatting.html
index bca0390d81..f2abf9f197 100644
--- a/tp/tests/layout/res_parser/formatting_inline_css/formatting.html
+++ b/tp/tests/layout/res_parser/formatting_inline_css/formatting.html
@@ -1110,14 +1110,14 @@ After clickstyle &rArr;
 <code class="code">@clicksequence{click @click{} A}</code> click &rArr; A
 </p>
 
-<pre class="displaymath" style="font-style: italic; font-family: 
serif">disp--laymath
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">disp--laymath
 f(x) = {1 \over \sigma \sqrt{2\pi}}e<sup class="sup">-{1 \over 2}\left({x-\mu 
\over \sigma}\right)^2</sup>
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: 
serif"><strong class="strong">``simple-double--three---four----''</strong> 
aa<!-- /@w -->
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center"><strong 
class="strong">``simple-double--three---four----''</strong> aa<!-- /@w -->
 `<!-- /@w -->`simple-double-<!-- /@w -->-three---four----'<!-- /@w -->'
 
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: 
serif">&inodot; &#567;
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&inodot; &#567;
 &#322; &ccedil;
 
 a&#818; &#7841; &#261; a<sup class="sup">h</sup><sub class="sub">l</sub>
@@ -1125,7 +1125,7 @@ a&#818; &#7841; &#261; a<sup class="sup">h</sup><sub 
class="sub">l</sub>
  &nbsp;&nbsp; &nbsp;  ! @ } { 
 a sunny day
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif">&rarr;
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&rarr;
 &#x0075;
 &bull; &copy; ... ... &equiv;
 error&rarr; &rarr; &minus; -| &rArr;
@@ -1133,12 +1133,12 @@ error&rarr; &rarr; &minus; -| &rArr;
 &THORN; &eth; &thorn; &iexcl; &iquest; &pound;
 &ordf; &ordm; , 
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: 
serif">&ldquo; &rdquo; 
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&ldquo; &rdquo; 
 &lsquo; &rsquo; &bdquo; &sbquo; &laquo;
 &raquo; &laquo; &raquo; &lsaquo;
 &rsaquo; &euro; &rarr; &le; &ge;
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif"><b 
class="b">b</b> <i class="i">i</i> <span class="r" style="font-family: initial; 
font-weight: normal; font-style: normal">r</span> <small class="sc">SC</small> 
<span class="sansserif" style="font-family: sans-serif; font-weight: 
normal">sansserif</span> <i class="slanted">slanted</i>
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center"><b class="b">b</b> <i class="i">i</i> 
<span class="r" style="font-family: initial; font-weight: normal; font-style: 
normal">r</span> <small class="sc">SC</small> <span class="sansserif" 
style="font-family: sans-serif; font-weight: normal">sansserif</span> <i 
class="slanted">slanted</i>
 </pre>
 <p><kbd class="kbd" style="font-style: oblique">default kbdinputstyle</kbd>
 </p><dl class="vtable">
@@ -1881,14 +1881,14 @@ html ''
 
 <strong class="author">author</strong><br>
 
-<pre class="displaymath" style="font-style: italic; font-family: serif">&uuml; 
&Uuml; &ntilde; &acirc; &eacute; &#333; &igrave; &eacute; &#274;&#768;
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&uuml; &Uuml; &ntilde; &acirc; &eacute; 
&#333; &igrave; &eacute; &#274;&#768;
 &#262;&#807; &#262;&#807; a&#779; &#551; &aring; a&#865;
 &#259; &#462;
  ? .
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif">TeX 
LaTeX &lowast; &aring; &reg; &deg; 
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">TeX LaTeX &lowast; &aring; &reg; &deg; 
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif"><code 
class="t">t</code> 
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center"><code class="t">t</code> 
 </pre>
 <ul class="itemize">
 <li>e&ndash;mph item
@@ -2216,14 +2216,14 @@ After clickstyle &rArr;
 <code class="code">@clicksequence{click @click{} A}</code> click &rArr; A
 </p>
 
-<pre class="displaymath" style="font-style: italic; font-family: 
serif">disp--laymath
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">disp--laymath
 f(x) = {1 \over \sigma \sqrt{2\pi}}e<sup class="sup">-{1 \over 2}\left({x-\mu 
\over \sigma}\right)^2</sup>
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: 
serif"><strong class="strong">``simple-double--three---four----''</strong> 
aa<!-- /@w -->
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center"><strong 
class="strong">``simple-double--three---four----''</strong> aa<!-- /@w -->
 `<!-- /@w -->`simple-double-<!-- /@w -->-three---four----'<!-- /@w -->'
 
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: 
serif">&inodot; &#567;
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&inodot; &#567;
 &#322; &ccedil;
 
 a&#818; &#7841; &#261; a<sup class="sup">h</sup><sub class="sub">l</sub>
@@ -2231,7 +2231,7 @@ a&#818; &#7841; &#261; a<sup class="sup">h</sup><sub 
class="sub">l</sub>
  &nbsp;&nbsp; &nbsp;  ! @ } { 
 a sunny day
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif">&rarr;
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&rarr;
 &#x0075;
 &bull; &copy; ... ... &equiv;
 error&rarr; &rarr; &minus; -| &rArr;
@@ -2239,12 +2239,12 @@ error&rarr; &rarr; &minus; -| &rArr;
 &THORN; &eth; &thorn; &iexcl; &iquest; &pound;
 &ordf; &ordm; , 
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: 
serif">&ldquo; &rdquo; 
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&ldquo; &rdquo; 
 &lsquo; &rsquo; &bdquo; &sbquo; &laquo;
 &raquo; &laquo; &raquo; &lsaquo;
 &rsaquo; &euro; &rarr; &le; &ge;
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif"><b 
class="b">b</b> <i class="i">i</i> <span class="r" style="font-family: initial; 
font-weight: normal; font-style: normal">r</span> <small class="sc">SC</small> 
<span class="sansserif" style="font-family: sans-serif; font-weight: 
normal">sansserif</span> <i class="slanted">slanted</i>
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center"><b class="b">b</b> <i class="i">i</i> 
<span class="r" style="font-family: initial; font-weight: normal; font-style: 
normal">r</span> <small class="sc">SC</small> <span class="sansserif" 
style="font-family: sans-serif; font-weight: normal">sansserif</span> <i 
class="slanted">slanted</i>
 </pre>
 <p><kbd class="kbd" style="font-style: oblique">default kbdinputstyle</kbd>
 </p><dl class="vtable">
@@ -2986,14 +2986,14 @@ html ''
 </p>
 
 
-<pre class="displaymath" style="font-style: italic; font-family: serif">&uuml; 
&Uuml; &ntilde; &acirc; &eacute; &#333; &igrave; &eacute; &#274;&#768;
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&uuml; &Uuml; &ntilde; &acirc; &eacute; 
&#333; &igrave; &eacute; &#274;&#768;
 &#262;&#807; &#262;&#807; a&#779; &#551; &aring; a&#865;
 &#259; &#462;
  ? .
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif">TeX 
LaTeX &lowast; &aring; &reg; &deg; 
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">TeX LaTeX &lowast; &aring; &reg; &deg; 
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif"><code 
class="t">t</code> 
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center"><code class="t">t</code> 
 </pre>
 <ul class="itemize">
 <li>e&ndash;mph item
@@ -3365,14 +3365,14 @@ After clickstyle &rArr;
 <code class="code">@clicksequence{click @click{} A}</code> click &rArr; A
 </p>
 
-<pre class="displaymath" style="font-style: italic; font-family: 
serif">disp--laymath
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">disp--laymath
 f(x) = {1 \over \sigma \sqrt{2\pi}}e<sup class="sup">-{1 \over 2}\left({x-\mu 
\over \sigma}\right)^2</sup>
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: 
serif"><strong class="strong">``simple-double--three---four----''</strong> 
aa<!-- /@w -->
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center"><strong 
class="strong">``simple-double--three---four----''</strong> aa<!-- /@w -->
 `<!-- /@w -->`simple-double-<!-- /@w -->-three---four----'<!-- /@w -->'
 
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: 
serif">&inodot; &#567;
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&inodot; &#567;
 &#322; &ccedil;
 
 a&#818; &#7841; &#261; a<sup class="sup">h</sup><sub class="sub">l</sub>
@@ -3380,7 +3380,7 @@ a&#818; &#7841; &#261; a<sup class="sup">h</sup><sub 
class="sub">l</sub>
  &nbsp;&nbsp; &nbsp;  ! @ } { 
 a sunny day
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif">&rarr;
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&rarr;
 &#x0075;
 &bull; &copy; ... ... &equiv;
 error&rarr; &rarr; &minus; -| &rArr;
@@ -3388,12 +3388,12 @@ error&rarr; &rarr; &minus; -| &rArr;
 &THORN; &eth; &thorn; &iexcl; &iquest; &pound;
 &ordf; &ordm; , 
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: 
serif">&ldquo; &rdquo; 
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&ldquo; &rdquo; 
 &lsquo; &rsquo; &bdquo; &sbquo; &laquo;
 &raquo; &laquo; &raquo; &lsaquo;
 &rsaquo; &euro; &rarr; &le; &ge;
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif"><b 
class="b">b</b> <i class="i">i</i> <span class="r" style="font-family: initial; 
font-weight: normal; font-style: normal">r</span> <small class="sc">SC</small> 
<span class="sansserif" style="font-family: sans-serif; font-weight: 
normal">sansserif</span> <i class="slanted">slanted</i>
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center"><b class="b">b</b> <i class="i">i</i> 
<span class="r" style="font-family: initial; font-weight: normal; font-style: 
normal">r</span> <small class="sc">SC</small> <span class="sansserif" 
style="font-family: sans-serif; font-weight: normal">sansserif</span> <i 
class="slanted">slanted</i>
 </pre>
 <p><kbd class="kbd" style="font-style: oblique">default kbdinputstyle</kbd>
 </p><dl class="vtable">
@@ -4135,14 +4135,14 @@ html ''
 </p>
 
 
-<pre class="displaymath" style="font-style: italic; font-family: serif">&uuml; 
&Uuml; &ntilde; &acirc; &eacute; &#333; &igrave; &eacute; &#274;&#768;
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&uuml; &Uuml; &ntilde; &acirc; &eacute; 
&#333; &igrave; &eacute; &#274;&#768;
 &#262;&#807; &#262;&#807; a&#779; &#551; &aring; a&#865;
 &#259; &#462;
  ? .
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif">TeX 
LaTeX &lowast; &aring; &reg; &deg; 
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">TeX LaTeX &lowast; &aring; &reg; &deg; 
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif"><code 
class="t">t</code> 
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center"><code class="t">t</code> 
 </pre>
 <ul class="itemize">
 <li>e&ndash;mph item
@@ -4469,14 +4469,14 @@ After clickstyle &rArr;
 <code class="code">@clicksequence{click @click{} A}</code> click &rArr; A
 </p>
 
-<pre class="displaymath" style="font-style: italic; font-family: 
serif">disp--laymath
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">disp--laymath
 f(x) = {1 \over \sigma \sqrt{2\pi}}e<sup class="sup">-{1 \over 2}\left({x-\mu 
\over \sigma}\right)^2</sup>
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: 
serif"><strong class="strong">``simple-double--three---four----''</strong> 
aa<!-- /@w -->
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center"><strong 
class="strong">``simple-double--three---four----''</strong> aa<!-- /@w -->
 `<!-- /@w -->`simple-double-<!-- /@w -->-three---four----'<!-- /@w -->'
 
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: 
serif">&inodot; &#567;
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&inodot; &#567;
 &#322; &ccedil;
 
 a&#818; &#7841; &#261; a<sup class="sup">h</sup><sub class="sub">l</sub>
@@ -4484,7 +4484,7 @@ a&#818; &#7841; &#261; a<sup class="sup">h</sup><sub 
class="sub">l</sub>
  &nbsp;&nbsp; &nbsp;  ! @ } { 
 a sunny day
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif">&rarr;
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&rarr;
 &#x0075;
 &bull; &copy; ... ... &equiv;
 error&rarr; &rarr; &minus; -| &rArr;
@@ -4492,12 +4492,12 @@ error&rarr; &rarr; &minus; -| &rArr;
 &THORN; &eth; &thorn; &iexcl; &iquest; &pound;
 &ordf; &ordm; , 
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: 
serif">&ldquo; &rdquo; 
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&ldquo; &rdquo; 
 &lsquo; &rsquo; &bdquo; &sbquo; &laquo;
 &raquo; &laquo; &raquo; &lsaquo;
 &rsaquo; &euro; &rarr; &le; &ge;
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif"><b 
class="b">b</b> <i class="i">i</i> <span class="r" style="font-family: initial; 
font-weight: normal; font-style: normal">r</span> <small class="sc">SC</small> 
<span class="sansserif" style="font-family: sans-serif; font-weight: 
normal">sansserif</span> <i class="slanted">slanted</i>
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center"><b class="b">b</b> <i class="i">i</i> 
<span class="r" style="font-family: initial; font-weight: normal; font-style: 
normal">r</span> <small class="sc">SC</small> <span class="sansserif" 
style="font-family: sans-serif; font-weight: normal">sansserif</span> <i 
class="slanted">slanted</i>
 </pre>
 <p><kbd class="kbd" style="font-style: oblique">default kbdinputstyle</kbd>
 </p><dl class="vtable">
@@ -5239,14 +5239,14 @@ html ''
 </p>
 
 
-<pre class="displaymath" style="font-style: italic; font-family: serif">&uuml; 
&Uuml; &ntilde; &acirc; &eacute; &#333; &igrave; &eacute; &#274;&#768;
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&uuml; &Uuml; &ntilde; &acirc; &eacute; 
&#333; &igrave; &eacute; &#274;&#768;
 &#262;&#807; &#262;&#807; a&#779; &#551; &aring; a&#865;
 &#259; &#462;
  ? .
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif">TeX 
LaTeX &lowast; &aring; &reg; &deg; 
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">TeX LaTeX &lowast; &aring; &reg; &deg; 
 </pre>
-<pre class="displaymath" style="font-style: italic; font-family: serif"><code 
class="t">t</code> 
+<pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center"><code class="t">t</code> 
 </pre>
 <ul class="itemize">
 <li>e&ndash;mph item
@@ -5584,16 +5584,16 @@ After clickstyle &rArr;
 <code class="code">@clicksequence{click @click{} A}</code> click &rArr; A
 
 
-</pre><pre class="displaymath" style="font-style: italic; font-family: 
serif">disp--laymath
+</pre><pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">disp--laymath
 f(x) = {1 \over \sigma \sqrt{2\pi}}e<sup class="sup">-{1 \over 2}\left({x-\mu 
\over \sigma}\right)^2</sup>
 </pre><pre class="example-preformatted">
 
-</pre><pre class="displaymath" style="font-style: italic; font-family: 
serif"><strong class="strong">``simple-double--three---four----''</strong> 
aa<!-- /@w -->
+</pre><pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center"><strong 
class="strong">``simple-double--three---four----''</strong> aa<!-- /@w -->
 `<!-- /@w -->`simple-double-<!-- /@w -->-three---four----'<!-- /@w -->'
 
 </pre><pre class="example-preformatted">
 
-</pre><pre class="displaymath" style="font-style: italic; font-family: 
serif">&inodot; &#567;
+</pre><pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&inodot; &#567;
 &#322; &ccedil;
 
 a&#818; &#7841; &#261; a<sup class="sup">h</sup><sub class="sub">l</sub>
@@ -5602,7 +5602,7 @@ a&#818; &#7841; &#261; a<sup class="sup">h</sup><sub 
class="sub">l</sub>
 a sunny day
 </pre><pre class="example-preformatted">
 
-</pre><pre class="displaymath" style="font-style: italic; font-family: 
serif">&rarr;
+</pre><pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&rarr;
 &#x0075;
 &bull; &copy; ... ... &equiv;
 error&rarr; &rarr; &minus; -| &rArr;
@@ -5611,13 +5611,13 @@ error&rarr; &rarr; &minus; -| &rArr;
 &ordf; &ordm; , 
 </pre><pre class="example-preformatted">
 
-</pre><pre class="displaymath" style="font-style: italic; font-family: 
serif">&ldquo; &rdquo; 
+</pre><pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&ldquo; &rdquo; 
 &lsquo; &rsquo; &bdquo; &sbquo; &laquo;
 &raquo; &laquo; &raquo; &lsaquo;
 &rsaquo; &euro; &rarr; &le; &ge;
 </pre><pre class="example-preformatted">
 
-</pre><pre class="displaymath" style="font-style: italic; font-family: 
serif"><b class="b">b</b> <i class="i">i</i> <span class="r" 
style="font-family: initial; font-weight: normal; font-style: normal">r</span> 
<span class="sc">SC</span> <span class="sansserif" style="font-family: 
sans-serif; font-weight: normal">sansserif</span> <i class="slanted">slanted</i>
+</pre><pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center"><b class="b">b</b> <i class="i">i</i> 
<span class="r" style="font-family: initial; font-weight: normal; font-style: 
normal">r</span> <span class="sc">SC</span> <span class="sansserif" 
style="font-family: sans-serif; font-weight: normal">sansserif</span> <i 
class="slanted">slanted</i>
 </pre><pre class="example-preformatted">
 
 <kbd class="kbd" style="font-style: oblique">default kbdinputstyle</kbd>
@@ -6486,16 +6486,16 @@ Invalid use of @':
 
 
 
-</pre><pre class="displaymath" style="font-style: italic; font-family: 
serif">&uuml; &Uuml; &ntilde; &acirc; &eacute; &#333; &igrave; &eacute; 
&#274;&#768;
+</pre><pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">&uuml; &Uuml; &ntilde; &acirc; &eacute; 
&#333; &igrave; &eacute; &#274;&#768;
 &#262;&#807; &#262;&#807; a&#779; &#551; &aring; a&#865;
 &#259; &#462;
  ? .
 </pre><pre class="example-preformatted">
 
-</pre><pre class="displaymath" style="font-style: italic; font-family: 
serif">TeX LaTeX &lowast; &aring; &reg; &deg; 
+</pre><pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center">TeX LaTeX &lowast; &aring; &reg; &deg; 
 </pre><pre class="example-preformatted">
 
-</pre><pre class="displaymath" style="font-style: italic; font-family: 
serif"><code class="t">t</code> 
+</pre><pre class="displaymath" style="font-style: italic; font-family: serif; 
display: flex; justify-content: center"><code class="t">t</code> 
 </pre><pre class="example-preformatted">
 
 </pre><ul class="itemize">
diff --git a/tp/tests/layout/res_parser/formatting_mathjax/formatting.html 
b/tp/tests/layout/res_parser/formatting_mathjax/formatting.html
index d9f1cd03da..c0a2e1cb1c 100644
--- a/tp/tests/layout/res_parser/formatting_mathjax/formatting.html
+++ b/tp/tests/layout/res_parser/formatting_mathjax/formatting.html
@@ -888,7 +888,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 span.r {font-family: initial; font-weight: normal; font-style: normal}
 span.sansserif {font-family: sans-serif; font-weight: normal}
diff --git 
a/tp/tests/layout/res_parser/formatting_numerical_entities/formatting.html 
b/tp/tests/layout/res_parser/formatting_numerical_entities/formatting.html
index 3ce3dc2682..b2e147c3f0 100644
--- a/tp/tests/layout/res_parser/formatting_numerical_entities/formatting.html
+++ b/tp/tests/layout/res_parser/formatting_numerical_entities/formatting.html
@@ -889,7 +889,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 pre.menu-comment-preformatted {font-family: serif}
 pre.menu-entry-description-preformatted {font-family: serif; display: inline}
diff --git 
a/tp/tests/layout/res_parser/formatting_sort_element_counts/formatting.html 
b/tp/tests/layout/res_parser/formatting_sort_element_counts/formatting.html
index d026286f51..e363b136d2 100644
--- a/tp/tests/layout/res_parser/formatting_sort_element_counts/formatting.html
+++ b/tp/tests/layout/res_parser/formatting_sort_element_counts/formatting.html
@@ -887,7 +887,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 span.r {font-family: initial; font-weight: normal; font-style: normal}
 span.sansserif {font-family: sans-serif; font-weight: normal}
diff --git a/tp/tests/layout/res_parser/formatting_texi2html/formatting.html 
b/tp/tests/layout/res_parser/formatting_texi2html/formatting.html
index d53cd7bf2f..c7d4d7524f 100644
--- a/tp/tests/layout/res_parser/formatting_texi2html/formatting.html
+++ b/tp/tests/layout/res_parser/formatting_texi2html/formatting.html
@@ -884,7 +884,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 pre.menu-comment-preformatted {font-family: serif}
 pre.menu-entry-description-preformatted {font-family: serif; display: inline}
diff --git a/tp/tests/layout/res_parser/formatting_texi2html_nodes/chapter.html 
b/tp/tests/layout/res_parser/formatting_texi2html_nodes/chapter.html
index 3126ff99b4..677f2e43c6 100644
--- a/tp/tests/layout/res_parser/formatting_texi2html_nodes/chapter.html
+++ b/tp/tests/layout/res_parser/formatting_texi2html_nodes/chapter.html
@@ -882,7 +882,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 pre.menu-comment-preformatted {font-family: serif}
 pre.menu-entry-description-preformatted {font-family: serif; display: inline}
diff --git a/tp/tests/layout/res_parser/formatting_texi2html_nodes/index.html 
b/tp/tests/layout/res_parser/formatting_texi2html_nodes/index.html
index 711adefce1..ecce3a5fc7 100644
--- a/tp/tests/layout/res_parser/formatting_texi2html_nodes/index.html
+++ b/tp/tests/layout/res_parser/formatting_texi2html_nodes/index.html
@@ -882,7 +882,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 pre.menu-comment-preformatted {font-family: serif}
 span.program-in-footer {font-size: smaller}
diff --git a/tp/tests/layout/res_parser/formatting_weird_quotes/formatting.html 
b/tp/tests/layout/res_parser/formatting_weird_quotes/formatting.html
index 6b83da466b..a73ee3ff98 100644
--- a/tp/tests/layout/res_parser/formatting_weird_quotes/formatting.html
+++ b/tp/tests/layout/res_parser/formatting_weird_quotes/formatting.html
@@ -889,7 +889,7 @@ kbd.key {font-style: normal}
 p.flushleft-paragraph {text-align:left}
 p.flushright-paragraph {text-align:right}
 pre.display-preformatted {font-family: inherit}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 pre.format-preformatted {font-family: inherit}
 pre.menu-comment-preformatted {font-family: serif}
 pre.menu-entry-description-preformatted {font-family: serif; display: inline}
diff --git a/tp/tests/tex_html/res_parser/tex_gdef_mathjax/tex_gdef.html 
b/tp/tests/tex_html/res_parser/tex_gdef_mathjax/tex_gdef.html
index 8cb232c352..c0cb238717 100644
--- a/tp/tests/tex_html/res_parser/tex_gdef_mathjax/tex_gdef.html
+++ b/tp/tests/tex_html/res_parser/tex_gdef_mathjax/tex_gdef.html
@@ -16,7 +16,7 @@
 <style type="text/css">
 <!--
 a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 span:hover a.copiable-link {visibility: visible}
 -->
 </style>
diff --git a/tp/tests/tex_html/res_parser/tex_mathjax/tex.html 
b/tp/tests/tex_html/res_parser/tex_mathjax/tex.html
index cc20d1f0c1..fb8f1f18ed 100644
--- a/tp/tests/tex_html/res_parser/tex_mathjax/tex.html
+++ b/tp/tests/tex_html/res_parser/tex_mathjax/tex.html
@@ -16,7 +16,7 @@
 <style type="text/css">
 <!--
 a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 span:hover a.copiable-link {visibility: visible}
 -->
 </style>
diff --git a/tp/tests/tex_html/res_parser/tex_notex/tex.html 
b/tp/tests/tex_html/res_parser/tex_notex/tex.html
index 045a08b277..bd51908427 100644
--- a/tp/tests/tex_html/res_parser/tex_notex/tex.html
+++ b/tp/tests/tex_html/res_parser/tex_notex/tex.html
@@ -16,7 +16,7 @@
 <style type="text/css">
 <!--
 a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em}
-pre.displaymath {font-style: italic; font-family: serif}
+pre.displaymath {font-style: italic; font-family: serif; display: flex; 
justify-content: center}
 span:hover a.copiable-link {visibility: visible}
 -->
 </style>



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