script: Implement the HTMLTrackElement API
Implement the basics of the HTMLTrackElement and update the wpt tests.
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] There are tests for these changes
Fixes: https://github.com/servo/servo/issues/22313
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Add onmessageerror to WindowEventHandler
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Basic HTMLMediaElement seeking
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix#21998
This allows media seeking only when the server supports byte-range requests.
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Remove the HTMLTable{Header,Data}CellElement interfaces
Fixes#17222.
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This removes the `HTMLTableHeaderCellElement` and `HTMLTableDataCellElement` interfaces and uses the `HTMLTableCellElement` interface for both `th` and `td` elements, as per the spec.
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The test document_domain_setter.html now fails, but AFAIK the origin
comparison can never be true (document.origin is the unprefixed domain,
while the loaded iframe is from www1.…), and that test fails in all
major browsers because of security exceptions anyway.
