Remove never-implemented CSS at-rule features#5122
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chrisdavidmills merged 4 commits intomdn:mainfrom May 20, 2021
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This is sorta-kinda implemented in a way that's meaningless. It appears to have preserved as a convenience to spec authors: w3c/csswg-drafts#594 w3c/csswg-drafts#1778 w3c/csswg-drafts@2c28928
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This all makes sense to me; thanks @ddbeck !
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In mdn/browser-compat-data#6944, we're dropping some features which are all-
false. In addition to being unsupported, these features don't show any sign of being implemented (i.e., a search of Firefox, Chrome, and WebKit bugs doesn't turn up any evidence of implementation—with one exception, below).https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-transparency
https://developer.mozilla.org/en-US/docs/Web/CSS/@media/scan
https://developer.mozilla.org/en-US/docs/Web/CSS/@page/bleed
https://developer.mozilla.org/en-US/docs/Web/CSS/@page/marks
mdn/browser-compat-data#6944
The
scanmedia query is exceptional: it may be partially implemented in Chrome, but it doesn't do anything (for obvious reasons, I couldn't confirm this via testing). It seems to have been retained as a convenience to specification authors. See d9c73be for details.