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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- [x] These changes fix#26440
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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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Update XRWebGLLayer to match specification.
This unbreaks most of the webxr WPT tests.
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- [x] These changes fix#27312
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2020, not yet wired to the rest of layout.
This commit implements an object that handles the 10 rules in CSS 2.1:
https://www.w3.org/TR/CSS2/visuren.html#float-position
The implementation strategy is that of a persistent balanced binary search tree
of float bands. Binary search trees are commonly used for implementing float
positioning; e.g. by WebKit. Persistence enables each object that interacts
with floats to efficiently contain a snapshot of the float list at the time
that object was laid out. That way, incremental layout can invalidate and start
reflow at any point in a containing block.
This commit features extensive use of
[QuickCheck](https://github.com/BurntSushi/quickcheck) to ensure that the rules
of the CSS specification are followed.
Because this is not yet connected to layout, floats will not actually be laid
out in Web pages yet.
Note that unit tests as set up in Servo currently require types that they
access to be public. Therefore, some internal layout 2020 types that were
previously private have been made public. This is somewhat unfortunate.
Part of #25167.
Introduce dynamic module
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