stylo: Make specified::parse_number() return finite f32.
We need to clamp the float numbers to avoid positive/negative infinity in timing functions, transform functions, and other possible css values to avoid undefined behaviors and assertions.
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- [X] These changes fix [Bug 1343153](https://bugzilla.mozilla.org/show_bug.cgi?id=1343153) and [Bug 1336769](https://bugzilla.mozilla.org/show_bug.cgi?id=1336769)
- [X] These changes do not require tests because gecko has related tests
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stylo: Sequentialize binding generation if logging is enabled.
Otherwise the log is useless, and it's even slower than in parallel mode due to
the high lock contention.
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Addresses #15401
The desired result is for `CSSWideKeyword`s to return false (they are
parsed) and other Custom declaration values to return true (they are unparsed).
Fixes font shorthand serialization so that it serializes to "" when
certain subproperties of the font shorthand are set to non-default
values. These subproperties are:
- font-size-adjust
- font-kerning
- font-variant-caps
- font-variant-position
- font-language-override
Additionally, enable the above subproperties in the tests.
Stylo: Add support for -moz-* pseudo-classes for alt text
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- [X] These changes fix [Bug 1341642](https://bugzilla.mozilla.org/show_bug.cgi?id=1341642)
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