[whatwg/dom] Make DOMTokenList's supported token concept also depend on element (PR #1431)

It makes no sense for it to just depend on the attribute name.

Also modernize this section while here.

(PR template doesn't apply as this is mostly a clarification. The creation steps for this object seem incorrect to me by the way, as I doubt we want to make that result in a mutation record, but that's best solved separately.)
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1431

-- Commit Summary --

  * Make DOMTokenList's supported token concept also depend on element

-- File Changes --

    M dom.bs (103)

-- Patch Links --

https://github.com/whatwg/dom/pull/1431.patch
https://github.com/whatwg/dom/pull/1431.diff

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