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Document lax ID selector syntax as a non-standard extension #181

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Aug 9, 2026
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Document lax ID selector syntax as a non-standard extension #181

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3 changes: 3 additions & 0 deletions docs/index.rst
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Expand Up @@ -124,6 +124,9 @@ be implemented):

These are non-standard extensions:

* ID selectors whose value is not a valid CSS identifier, e.g. ``#37signals``.
The specification only allows an identifier after ``#``, so such IDs, which
are valid in HTML, would otherwise require ``[id="37signals"]``.
* The ``:contains(text)`` pseudo-class that existed in `an early draft`_
but was then removed.
* The ``!=`` attribute operator. ``[foo!=bar]`` is the same as
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