Add VTTRegion and part of VTTCue DOM interfaces
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Hello! In this PR I implemented the VTTRegion DOM interface and part of VTTCue (#22312). Before continuing I thought it's maybe a good idea to first request a review or even merge what I did up to this point, as I might get stuck on the next part. I have a slight idea of what needs to be done (I assume it's hooking the GStreamer parser somewhere in `GetCueAsHTML()`), but a short outline or some more instructions would help a lot.
I updated test expectations by first running:
```
./mach test-wpt tests/wpt/web-platform-tests/webvtt/api --log-raw servo.log --pref dom.webvtt.enabled=true
```
then
```
./mach update-wpt servo.log
```
Thanks!
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Render HTML <canvas> elements on layout 2020
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- [X] These changes fix#25885
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Improved the WebGL2 framebuffer render validation
It seems `MissingColorAttachment` should be returned only when all of the color attachments are missing.
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cc @jdm @zakorgy
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Allow more WebGL2 FBO attachment formats
Add support for most of the framebuffer attachment formats introduced in WebGL2 for textures and renderbuffers.
Related format tables:
- https://www.khronos.org/registry/OpenGL-Refpages/es3.0/html/glTexImage2D.xhtml
- https://www.khronos.org/registry/OpenGL-Refpages/es3.0/html/glRenderbufferStorage.xhtml
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cc @jdm @zakorgy
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Add support for WebGL2 framebuffer invalidation
Adds support for the `invalidateFramebuffer` and `invalideSubFramebuffer` WebGL2 calls.
See: https://www.khronos.org/registry/webgl/specs/latest/2.0/#3.7.4
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Depends on #25785.
cc @jdm @zakorgy
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Make CanvasRenderingContext2D.fillRect() draw patterns correctly
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This is a feature that was never properly implemented in the previous
layout system. We still need to preserve their in-tree order in the
display list though.
Move tinyfiledialog call from script to embedder
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PR is based on work started in #23651. I rebased on top of master and addressed review comments. Handling the `PromptPermission` message in `libsimpleservo` is probably not ideal. Looking forward to make more changes, just let me know how I should proceed.
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Upgrade to mozdebug 0.2
These changes fix#25868
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Generate ::before and ::after content from url() for layout2020
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make Document.getElementsByName a live collection
Another new case for NodeList; this and the labels live collection in #25424 are in the pipeline simultaneously, so one of them will need a merge resolution when the other one lands.
Iterating over many same-named elements is potentially slower than it has to be, since getting the nth element from the live view always starts from the start of the tree.
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