Revert webrender upgrade
These commits revert the webrender and font-related updates from #27207. This will unbreak our FxR nightly builds while we continue to investigate the underlying crash in ANGLE. Unfortunately it also returns us to the status quo of broken canvas text rendering on UWP, but there's no way to upgrade font-kit without any of the other crates because of the underlying freetype dependency changes that happened.
Fixes#27492.
Add dummy implementations of missing XR layer types
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Add dummy implementations of the missing layer types, and the functions that create them.
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Add a copy of WebGPU CTS to wpt.
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The test suite is generated from `glsl-dependent` branch in https://github.com/gpuweb/cts
We already have 6/44 tests passing and a number of subtests in other tests also pass.
r?@jdm
cc @kvark
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WebXR Layers update WebIDL
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Updates the WebXR Layers WebIDL. Implements the "update the pending layers state" algorithm from the layer spec.
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Fire mouseenter and mouseleave events
The PR primarily consists of changes for:
- Fixing the order in which `mousemove` events are fired.
- Firing `mouseenter` and `mouseleave` events.
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Layout 2020: Implement basic white-space: pre support
With these changes `<pre>` and `<br>` preserve spaces and force line breaks appropriately.
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Layout 2020: Implement `clip: rect`
This implements `clip: rect`
Unfortunately, none of the tests pass yet, they are all broken due to https://github.com/servo/servo/issues/27387
Additionally, currently `clip` does not seem to clip the element itself, only its children. I'm not quite sure what to do about that, I patterned this off of the code in the layout 2013 which handled clip immediately after scroll overflow.
Implemented get element target algorithm
Added check for area and anchor element
Finished issue: Implemented get target and no opener algorithm
Implemented get element target and get element noopener algorithms.
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Used the algorithms in html spec to implement target and no opener algorithms.
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Compile external scripts off the main thread
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