[Python-checkins] [3.12] gh-131204: Fix `difflib.HtmlDiff` may not use monospaced font (GH-131221) (#131243)

[hugovk]

https://github.com/python/cpython/commit/e364a4212ec557ac04ecf9fe83ac482b72c1a47a
commit: e364a4212ec557ac04ecf9fe83ac482b72c1a47a
branch: 3.12
author: Wulian233 <1055917...@qq.com>
committer: hugovk <1324225+hug...@users.noreply.github.com>
date: 2025-03-14T12:23:39Z
summary:

[3.12] gh-131204: Fix `difflib.HtmlDiff` may not use monospaced font 
(GH-131221) (#131243)

(cherry picked from commit 7fd6160)

files:
A Misc/NEWS.d/next/Library/2025-03-14-09-28-13.gh-issue-131204.wogNEX.rst
M Lib/difflib.py
M Lib/test/test_difflib_expect.html

diff --git a/Lib/difflib.py b/Lib/difflib.py
index ba0b256969ebff..33e7e6c165aa0c 100644
--- a/Lib/difflib.py
+++ b/Lib/difflib.py
@@ -1628,7 +1628,7 @@ def _line_pair_iterator():
 </html>"""
 
 _styles = """
-        table.diff {font-family:Courier; border:medium;}
+        table.diff {font-family: Menlo, Consolas, Monaco, Liberation Mono, 
Lucida Console, monospace; border:medium}
         .diff_header {background-color:#e0e0e0}
         td.diff_header {text-align:right}
         .diff_next {background-color:#c0c0c0}
diff --git a/Lib/test/test_difflib_expect.html 
b/Lib/test/test_difflib_expect.html
index 3e6a7b7a9933d6..12091206a2856d 100644
--- a/Lib/test/test_difflib_expect.html
+++ b/Lib/test/test_difflib_expect.html
@@ -9,7 +9,7 @@
           content="text/html; charset=utf-8" />
     <title></title>
     <style type="text/css">
-        table.diff {font-family:Courier; border:medium;}
+        table.diff {font-family: Menlo, Consolas, Monaco, Liberation Mono, 
Lucida Console, monospace; border:medium}
         .diff_header {background-color:#e0e0e0}
         td.diff_header {text-align:right}
         .diff_next {background-color:#c0c0c0}
diff --git 
a/Misc/NEWS.d/next/Library/2025-03-14-09-28-13.gh-issue-131204.wogNEX.rst 
b/Misc/NEWS.d/next/Library/2025-03-14-09-28-13.gh-issue-131204.wogNEX.rst
new file mode 100644
index 00000000000000..e821e61a0ca5ed
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-03-14-09-28-13.gh-issue-131204.wogNEX.rst
@@ -0,0 +1 @@
+Use monospace font from System Font Stack for cross-platform support in  
:class:`difflib.HtmlDiff`.

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