8000 Improved the styling of HTML diff pages generated by the `difflib.Htm… · python/cpython@c022435 · GitHub
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Improved the styling of HTML diff pages generated by the difflib.HtmlDiff 
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‎Doc/whatsnew/3.15.rst

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@@ -89,6 +89,13 @@ New modules
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Improved modules
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================
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difflib
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-------
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* Improved the styling of HTML diff pages generated by the :class:`difflib.HtmlDiff`
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class, and migrated the output to the HTML5 standard.
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(Contributed by Jiahao Li in :gh:`134580`.)
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ssl
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---
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‎Lib/difflib.py

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@@ -1615,16 +1615,13 @@ def _line_pair_iterator():
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_file_template = """
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html>
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type"
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content="text/html; charset=%(charset)s" />
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<title></title>
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<style type="text/css">%(styles)s
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<meta charset="%(charset)s">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Diff Comparison</title>
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<style>%(styles)s
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</style>
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</head>
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@@ -1636,20 +1633,45 @@ def _line_pair_iterator():
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_styles = """
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:root {color-scheme: light dark}
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table.diff {font-family: Menlo, Consolas, Monaco, Liberation Mono, Lucida Console, monospace; border:medium}
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.diff_header {background-color:#e0e0e0}
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td.diff_header {text-align:right}
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.diff_next {background-color:#c0c0c0}
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table.diff {
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font-family: Menlo, Consolas, Monaco, Liberation Mono, Lucida Console, monospace;
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border:medium;
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}
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.diff_header {
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background-color:#e0e0e0;
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font-weight:bold;
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}
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td.diff_header {
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text-align:right;
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padding:4px 8px;
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}
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.diff_next {
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background-color:#c0c0c0;
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padding:4px 0;
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}
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.diff_add {background-color:palegreen}
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.diff_chg {background-color:#ffff77}
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.diff_sub {background-color:#ffaaaa}
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table.diff[summary="Legends"] {
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margin-top: 20px;
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border: 1px solid #ccc;
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}
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table.diff[summary="Legends"] th {
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background-color: #e0e0e0;
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padding: 4px 8px;
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}
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table.diff[summary="Legends"] td {
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padding: 4px 8px;
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}
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@media (prefers-color-scheme: dark) {
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.diff_header {background-color:#666}
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.diff_next {background-color:#393939}
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.diff_add {background-color:darkgreen}
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.diff_chg {background-color:#847415}
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.diff_sub {background-color:darkred}
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table.diff[summary="Legends"] {border-color:#555}
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table.diff[summary="Legends"] th{background-color:#666}
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}"""
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_table_template = """
@@ -1692,7 +1714,7 @@ class HtmlDiff(object):
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make_table -- generates HTML for a single side by side table
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make_file -- generates complete HTML file with a single side by side table
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See tools/scripts/diff.py for an example usage of this class.
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See Doc/includes/diff.py for an example usage of this class.
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"""
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_file_template = _file_template

‎Lib/test/test_difflib.py

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@@ -255,21 +255,21 @@ def test_make_file_default_charset(self):
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html_diff = difflib.HtmlDiff()
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output = html_diff.make_file(patch914575_from1.splitlines(),
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patch914575_to1.splitlines())
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self.assertIn('content="text/html; charset=utf-8"', output)
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self.assertIn('charset="utf-8"', output)
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def test_make_file_iso88591_charset(self):
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html_diff = difflib.HtmlDiff()
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output = html_diff.make_file(patch914575_from1.splitlines(),
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patch914575_to1.splitlines(),
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charset='iso-8859-1')
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self.assertIn('content="text/html; charset=iso-8859-1"', output)
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self.assertIn('charset="iso-8859-1"', output)
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def test_make_file_usascii_charset_with_nonascii_input(self):
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html_diff = difflib.HtmlDiff()
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output = html_diff.make_file(patch914575_nonascii_from1.splitlines(),
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patch914575_nonascii_to1.splitlines(),
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charset='us-ascii')
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self.assertIn('content="text/html; charset=us-ascii"', output)
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self.assertIn('charset="us-ascii"', output)
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self.assertIn('&#305;mpl&#305;c&#305;t', output)
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class TestDiffer(unittest.TestCase):

‎Lib/test/test_difflib_expect.html

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html>
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type"
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content="text/html; charset=utf-8" />
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<title></title>
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<style type="text/css">
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Diff Comparison</title>
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<style>
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:root {color-scheme: light dark}
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table.diff {font-family: Menlo, Consolas, Monaco, Liberation Mono, Lucida Console, monospace; border:medium}
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.diff_header {background-color:#e0e0e0}
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td.diff_header {text-align:right}
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.diff_next {background-color:#c0c0c0}
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table.diff {
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font-family: Menlo, Consolas, Monaco, Liberation Mono, Lucida Console, monospace;
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border:medium;
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}
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.diff_header {
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background-color:#e0e0e0;
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font-weight:bold;
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}
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td.diff_header {
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text-align:right;
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padding:4px 8px;
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}
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.diff_next {
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background-color:#c0c0c0;
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padding:4px 0;
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}
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.diff_add {background-color:palegreen}
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.diff_chg {background-color:#ffff77}
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.diff_sub {background-color:#ffaaaa}
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table.diff[summary="Legends"] {
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margin-top: 20px;
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border: 1px solid #ccc;
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}
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table.diff[summary="Legends"] th {
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background-color: #e0e0e0;
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padding: 4px 8px;
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}
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table.diff[summary="Legends"] td {
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padding: 4px 8px;
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}
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@media (prefers-color-scheme: dark) {
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.diff_header {background-color:#666}
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.diff_next {background-color:#393939}
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.diff_add {background-color:darkgreen}
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.diff_chg {background-color:#847415}
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.diff_sub {background-color:darkred}
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table.diff[summary="Legends"] {border-color:#555}
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table.diff[summary="Legends"] th{background-color:#666}
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}
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</style>
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</head>

‎Misc/NEWS.d/next/Library/2025-05-23-20-01-52.gh-issue-134580.xnaJ70.rst

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Improved the styling of HTML diff pages generated by the
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:class:`difflib.HtmlDiff` class, and migrated the output to the HTML5
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standard.

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