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and related Selector pseudo-classes.
Although tinycss2 does not include a full Selector parser,
this bit of syntax is included as it is particularly tricky to define
on top of a CSS tokenizer.
:type input: :obj:`str` or :term:`iterable`
:param input: A string or an iterable of :term:`component values`.
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A ``(a, b)`` tuple of integers, or :obj:`None` if the input is invalid.
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