Support CSS Conditional 5 font feature detection extensions #35829
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[1] defines two additional conditional functions `font-tech()` and `font-format()` which were introduced after the resolution of TAG review [2] and discussion in the CSS working group [3]. These functions allow conditional CSS to be included depending on level of font support in the font stack of the UA. Feature detection becomes particular important when checking for the level of color font support, as UA capabilities still very and not all user agents provide support for COLRv1 for example. Implement behind `SupportsFontFormatTech` RuntimeEnabledFeatures flag for now, pending I2S. [1] https://www.w3.org/TR/css-conditional-5/#at-supports-ext [2] w3ctag/design-reviews#666 [3] w3c/csswg-drafts#6520 (comment) Bug: 1255685 Change-Id: I96ab292bc9644b049a84e073b367063cdbedd26f Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3197710 Commit-Queue: Dominik Röttsches <drott@chromium.org> Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org> Cr-Commit-Position: refs/heads/main@{#1046434}
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[1] defines two additional conditional functions
font-tech()andfont-format()which were introduced after the resolution of TAG review[2] and discussion in the CSS working group [3].
These functions allow conditional CSS to be included depending on level
of font support in the font stack of the UA. Feature detection becomes
particular important when checking for the level of color font support,
as UA capabilities still very and not all user agents provide support
for COLRv1 for example.
Implement behind
SupportsFontFormatTechRuntimeEnabledFeatures flagfor now, pending I2S.
[1] https://www.w3.org/TR/css-conditional-5/#at-supports-ext
[2] w3ctag/design-reviews#666
[3] w3c/csswg-drafts#6520 (comment)
Bug: 1255685
Change-Id: I96ab292bc9644b049a84e073b367063cdbedd26f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3197710
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1046434}