Implement the table section IDL attributes for HTML tables

[dzbarsky]

Rebasing this old PR. Still need to write tests but at least it compiles.

[eefriedman]

Review status: 0 of 3 files reviewed at latest revision, 2 unresolved discussions.

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components/script/dom/htmltableelement.rs, line 102 [r1] (raw file):
This can legitimately fail: if the table is nested inside the thead, this will throw a HierarchyRequestError.

Not sure if we're supposed to do that check before or after removing the existing thead.

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components/script/dom/htmltableelement.rs, line 116 [r1] (raw file):
I'm not sure what the recommended way to do Atom->DOMString conversion is at the moment; it's been fluctuating a bit. @asajeffrey ?

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Comments from the review on Reviewable.io

[bors-servo]

☔ The latest upstream changes (presumably #9056) made this pull request unmergeable. Please resolve the merge conflicts.

[KiChjang]

What's the status of this?

[dzbarsky]

The status is that it needs to address review comments and add tests but I haven't had time to work on it =/ If someone feels a desire to pick this up, I would appreciate it.

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Review status: 0 of 3 files reviewed at latest revision, 2 unresolved discussions, some commit checks failed.

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Comments from the review on Reviewable.io

[jdm]

Closed due to lack of updates, and filed #9769 to keep track of this. Thanks @dzbarsky!