Sourced from lxml's changelog.

6.0.0 (2025-06-26)

Features added

• GH#463: lxml.html.diff is faster and provides structurally better diffs. Original patch by Steven Fernandez.

• GH#405: The factories Element and ElementTree can now be used in type hints.

• GH#448: Parsing from memoryview and other buffers is supported to allow zero-copy parsing.

• GH#437: lxml.html.builder was missing several HTML5 tag names. Patch by Nick Tarleton.

• GH#458: CDATA can now be written into the incremental xmlfile() writer. Original patch by Lane Shaw.

• A new parser option decompress=False was added that controls the automatic input decompression when using libxml2 2.15.0 or later. Disabling this option by default will effectively prevent decompression bombs when handling untrusted input. Code that depends on automatic decompression must enable this option. Note that libxml2 2.15.0 was not released yet, so this option currently has no effect but can already be used.

• The set of compile time / runtime supported libxml2 feature names is available as etree.LIBXML_COMPILED_FEATURES and etree.LIBXML_FEATURES. This currently includes catalog, ftp, html, http, iconv, icu, lzma, regexp, schematron, xmlschema, xpath, zlib.

Bugs fixed

• GH#353: Predicates in .find*() could mishandle tag indices if a default namespace is provided. Original patch by Luise K.

• GH#272: The head and body properties of lxml.html elements failed if no such element was found. They now return None instead. Original patch by FVolral.

• Tag names provided by code (API, not data) that are longer than INT_MAX could be truncated or mishandled in other ways.

• .text_content() on lxml.html elements accidentally returned a "smart string" without additional information. It now returns a plain string.

• LP#2109931: When building lxml with coverage reporting, it now disables the sys.monitoring support due to the lack of support in nedbat/coveragepy#1790

... (truncated)

• 2a67034 Prepare release of 6.0.0.
• e0b4e02 Update changelog.
• d3f4dcf Build: Upgrade libxml2 to latest 2.14.4.
• 014e51c Build: Add Windows arm64 wheel builds (GH-465)
• d3914dc Only use "xmlCtxtIsStopped()" from libxml2 2.15.0 on since it fails to cover ...
• 6e41390 Avoid reading the deprecated "disableSAX" attribute of "xmlParserCtxt".
• f85da81 Use newer "language_level=3" in ElementPath module.
• 787315e Build: bump pypa/cibuildwheel in the github-actions group (#464)
• fb3adb1 Readme: Add project income report for 2024.
• 8e61a75 Fit cached tuple more nicely into cachelines.
• Additional commits viewable in compare view

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