The idea is to put the memmoving of the ThreadLocalContext out of line from the point of view of top_down_dom so we don't need to allocate a large chunk of stack space for it.
Let's follow how Gecko does for this part (in nsRuleNode::ComputeListData).
We set mImageRegion.height or mImageRegion.width to zero if bottom or right is
None (i.e. auto).
Fix revalidation selectors when pseudo-elements are involved.
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Don't accept an extra token at the end of transform property
The lack of `input.try` usage makes transform property to accept values like `rotate(70deg)foo`.
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Back out https://github.com/servo/servo/pull/17198 for Gecko test failures
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Implemented the plumbing for paint worklets
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This PR implements the plumbing for paint worklets:
* Adding CSS values for paint worklets.
* Implementing a skeleton for the `PaintWorkletGlobalScope` webidl.
* Implementing an executor for paint worklet tasks, and passing it from script to layout.
* Building the display list items for paint worklet images.
This PR does not implement registering or calling paint worklets in JS.
Before it merges, this PR needs a reftest added for basic paint worklet functionality.
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