Release 3.11.2

Fixed

• Sanitize attribute names in the fenced_code and legacy_attrs extensions so an
  attribute name cannot break out of its tag and inject markup (#1663).
• For backwards compatibility, revert the enforcement of CommonMark style
  punctuation rules (#1657).

Release 3.11.1

Fixed

• Update serializer to be non-recursive (#1644).
• Improve ancestor handling in the inline Treeprocessor (#1646).
• Keep a raw HTML comment inside an inline HTML element that closes in the
  same paragraph, instead of splitting the paragraph around it (#1643).
• Fix issue where inline HTML attributes were rejected if they had < or > in the attribute (#1647).
• Fix issue where an unterminated end tag (</foo) could cause all remaining content to be dropped (#1651).
• Complete rework of emphasis handling to improve nested emphasis handling better (#1632).

Release 3.11.0

Changed

• Inline processors now resume searching after the previous match, improving
  performance for repeated inline patterns (#1619).
• Officially support Python 3.15 and drop support for Python 3.10
• Walk backtick runs in BacktickInlineProcessor without a regex (#1620).
• Switch static site generator for documentation from MkDocs to Zensical
  (#1627, #1635, #1637, and #1638).

Fixed

• Ensure removing Abbreviations does not raise an error (#1634).
• Fix an issue with excessive backtracking when matching inline code blocks (#1617).
• md_in_html now honors tags added to Markdown.block_level_elements after
  the extension is loaded (#1246).
• Fix quadratic-time regex backtracking in ReferenceProcessor when a link
  reference definition has no URL, e.g. a line consisting only of [id]:
  followed by many trailing spaces (#798).
• Document attr_list usage for def_list (#1123).

Release 3.10.3

Fixed

• Fix SetextHeaderProcessor regex to prevent mixed = and - chars in setext-style headers (#1606).
• Add AI Policy to Contributing Guide.
• Officially document all included extensions as being in maintenance mode.
• Link the Extension API documentation to the API Reference (#1612).

Release 3.10.2

Fixed

• Fix a regression related to comment handling (#1590).
• More reliable fix for </ (#1593).

Release 3.10.1

Fixed

• Ensure nested elements inside inline comments are properly unescaped (#1571).
• Make the docs build successfully with mkdocstrings-python 2.0 (#1575).
• Fix infinite loop when multiple bogus or unclosed HTML comments appear in input (#1578).
• Fix another infinite loop when handling bad comments (#1586).

Release 3.10.0

Changed

• Officially support Python 3.14 and PyPy 3.11 and drop support for Python 3.9
  and PyPy 3.9.

Fixed

• Fix an HTML comment parsing case in some Python versions that can cause an
  infinite loop (#1554).
• Revert the default behavior of USE_DEFINITION_ORDER (to True). The new
  behavior introduced in 3.9.0 is experimental and results are inconsistent.
  It should not have been made the default behavior (#1561).

Release 3.9.0

Changed

• Footnotes are now ordered by the occurrence of their references in the
  document. A new configuration option for the footnotes extension,
  USE_DEFINITION_ORDER, has been added to support restoring the previous
  behavior of ordering footnotes by the occurrence of definitions (#1367).

Fixed

• Ensure inline processing iterates through elements in document order (#1546).
• Fix handling of incomplete HTML tags in code spans in Python 3.14 (#1547).

Release 3.8.2

Fixed

• Fix codecs deprecation in Python 3.14.
• Fix issue with unclosed comment parsing in Python 3.14.
• Fix issue with unclosed declarations in Python 3.14.
• Fix issue with unclosed HTML tag <foo and Python 3.14.

Release 3.8.1

Fixed

• Ensure incomplete markup declaration in raw HTML doesn't crash parser (#1534).
• Fixed dropped content in md_in_html (#1526).
• Fixed HTML handling corner case that prevented some content from not being rendered (#1528).