Pymdown-extensions

- **NEW**: Drop Python 3.6 support and formally add Python 3.10 support.
- **NEW**: Highlight: Add `pygments_lang_option` to enable attaching language classes to Pygments code blocks.
- **NEW**: SuperFences: Custom fence validators and formatters can now be forced to raise an exception by raising a
`SuperFencesException`.
- **NEW**: Keys: Add `power` and `fingerprint` keys.
- **FIX**: SuperFences: Fix case where custom fence in a blockquote was not gracefully handled.
- **FIX**: Arithmatex: fix issue where if you limit the inline or block syntax to specific input types, access to
certain matched groups could cause an error.

- **NEW**: Highlight: If `linenums` is enabled globally via the `highlight` extension, and a code block specifies a line
number of zero (e.g. SuperFences), disable line numbers for that code block.
- **FIX**: Snippets: Add missing documentation for `auto_append` feature that was added in 8.2.
- **FIX**: Highlight: When `attr_list` is enabled, attributes were not properly added to Pygments code blocks in the
`table` format. (1505)

Please see [Migration Notes](https://github.com/facelessuser/pymdown-extensions/blob/main/docs/src/markdown/about/releases/9.0.md) for details on upgrading to 9.0.

- **NEW**: Arithmatex: Wrap MathJax "script" format (non-preview) with a container element just like all other
Arithmatex output formats.
- **NEW**: Arithmatex: MathJax (non-generic) form's container element now has the `arithmatex` class added just like
everywhere else.
- **NEW**: Arithmatex: Add options to override HTML element container type of inline and block math.
- **NEW**: Arithmatex: Add new formatter functions intended to replace old math fenced/inline block formatters. New
formatter functions are configurable. All others are marked as deprecated and will be removed at some future date.
- **NEW**: Emoji: Upgraded Twitter emoji database to support latest emoji. It is a known issue that Twitter has
`:man_in_santa_hat:` and `:mx_claus:` backwards -- same for `:mrs_claus:` and `:woman_in_santa_hat:`. That is on
Twitter's side, not ours.
- **NEW**: Highlight: Add support for the Pygments option `linespans`.
- **NEW**: Highlight: Add support for Pygments option `lineanchors`.
- **NEW**: Highlight: Add support for Pygments option `anchorlinenos`.
- **NEW**: Highlight: Remove `legacy_no_wrap_code` option.
- **NEW**: Add support for generating title headers pulled from the Pygments lexer for code blocks. Feature can be
enabled via the new `auto_title` option. If a specific name is not preferred, these names can be overridden via
a user defined mapping called `auto_title_map`.
- **NEW**: SuperFences: Allow setting a title, or overriding an auto title via the new `title` option in a fenced code
header.
- **NEW**: SuperFences: Allow adding ID and arbitrary `data-` attributes on Pygments code blocks. The latter requires
the `attr_list` extension to be enabled.
- **NEW**: SuperFences: Removed old deprecated option `highlight_code` which no longer did anything.
- **NEW**: SuperFences: Remove legacy code meant to help with transitioning to new custom fence function format.
- **NEW**: Tabbed: New alternate style that allows for a scrollable tabs if they overflow. Feature is experimental, see
docs for more information.
- **NEW**: Slugs: Add new configurable `slugify` function that aims to replace all other slugify methods. Deprecate
`uslugify`, `uslugify_encoded`, `uslugify_case`, `uslugify_case_encoded`, `gfm`, and `gfm_encoded`. `slugify` takes
parameters returning a function that performs the desired slug handling. `slugify` adds new options `case="fold"` for
case folding and `normalize='<normalize format here>'` (uses `NFC` by default).
- **FIX**: BetterEm: Fix some complex cases related to "smart" logic. (1413)
- **FIX**: EscapeAll: Fix issue where an escaped HTML entity may end up with incorrect slug and incorrect table of
content entry.
- **FIX**: Highlight: Fix issue that occurs when showing only nth line numbers and using `pymdownx-inline`. Lines not
showing a line number would not render with the proper leading space.

- **NEW**: Snippets: now accepts a list of base paths which will be resolved in the order they are specified.
Compatibility is present with legacy behavior, and a single string path will still be accepted.
- **NEW**: Snippets: allow for specifying certain snippets to auto-append to every file. Useful for appending
abbreviations, reference links, etc.
- **NEW**: Snippets: a snippet base path can be a full path to a file. When a base path is a full path to a file, only
that file will be included from the specified folder. This allows for targeting a one off file outside of the normal
snippet paths(s).
- **NEW**: MagicLink: add GitHub Discussions support to MagicLink. Can now use `?<num>` to link discussions. Full
discussion links will also be shortened if shortening is enabled. (1187)
- **NEW**: MagicLink: add new `normalize_issue_symbols` option to make issues, pull request, and discussion links all
render with `` instead of ``, `!`, and `?` respectively. Input syntax is still the same. Great if you want a GitHub
style look where all issue types are just rendered with ``.
- **FIX**: MagicLink: documentation will not render links with special icons added via CSS so as not to confuse users
that may think that is part of MagicLink. While possible with CSS, MagicLink provides no CSS automatically.
- **FIX**: Tabbed &amp; Details: Fix corner case with lists. (1225)
- **FIX**: Fix issue with unescaping logic in code blocks.

- **FIX**: Ensure content immediately before Details content or Tabbed content gets preserved.
- **FIX**: StripHTML: Fix some corner cases related to stripping comments.

- **NEW**: Drop support for Python 3.5.
- **NEW**: Officially support Python 3.9.
- **NEW**: Tabbed titles can now have simple Markdown in them which can be parsed and rendered (like emoji, bold, etc.).
- **FIX**: Avoid parsing script tags in PathConverter and B64 extensions.