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After https://github.com/web-platform-tests/wpt/issues/11120, test-level asserts is the only remaining use of test-level metadata. Example:
https://github.com/web-platform-tests/wpt/blob/8bb0b769af8d…
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https://drafts.csswg.org/cssom/#fetch-a-css-style-sheet
https://html.spec.whatwg.org/multipage/#concept-link-obtain
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## Context
This issue was discovered when trying to run unrelated WPT tests (css-flexbox tests) in Servo. It turns out that many of them depend on this non-standard behaviour. For example https://w…
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Currently `adoptedStyleSheets` has a restriction on `CSSStyleSheets` that have the `constructed` flag set:
> The [set an indexed value](https://webidl.spec.whatwg.org/#observable-array-attribute-set-…
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I'm looking into how Window.getComputedStyle() behaves for margins.
https://drafts.csswg.org/cssom/#resolved-values
So the resolved value for margins is typically the used value. For percentage …
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https://drafts.csswg.org/css-grid/#propdef-grid-template-areas
> Note: These rules can produce cell names that do not match the syntax, such as "1st 2nd 3rd", which requires escaping when referenc…
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Per [MDN](https://developer.mozilla.org/en-US/docs/Web/API/Document/caretRangeFromPoint) it has been supported in Chrome and Safari for many years. While there is an alternative, I guess it should pro…
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https://drafts.csswg.org/cssom-view/#element-scrolling-members
> 4. Otherwise, block is "nearest":
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> → If element edge A and element edge B are both outside scrolling box edge A and scrolling…
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My first issue here. I'll be making a suggestion for [CSSOM View Module Events](https://www.w3.org/TR/cssom-view/#event-summary).
# Problem
We have solid control over various input events. For k…
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https://drafts.csswg.org/cssom-view/#the-screen-interface
`availWidth` and `availHeight` are in the spec, but not `availLeft` or `availTop`.
Those two attributes are in Chromium, Gecko and WebKi…