From: Wulian233 <1055917385@qq.com>
Date: Fri, 14 Mar 2025 12:27:13 +0000 (+0800)
Subject: [3.13] gh-131204: Fix `difflib.HtmlDiff` may not use monospaced font (GH-131221)... 
X-Git-Tag: v3.13.3~126
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=130fa4c94f41880fc17cda27e1878e28ddfdd65c;p=thirdparty%2FPython%2Fcpython.git

[3.13] gh-131204: Fix `difflib.HtmlDiff` may not use monospaced font (GH-131221) (#131242)

(cherry picked from commit 7fd6160)
---

diff --git a/Lib/difflib.py b/Lib/difflib.py
index ba0b256969eb..33e7e6c165aa 100644
--- a/Lib/difflib.py
+++ b/Lib/difflib.py
@@ -1628,7 +1628,7 @@ _file_template = """
 </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 3e6a7b7a9933..12091206a285 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 000000000000..e821e61a0ca5
--- /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`.