[whatwg/dom] Add toggleAttribute to Element. (#656)

See https://github.com/whatwg/dom/issues/461 for details.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/656

-- Commit Summary --

  * Add toggleAttribute to Element.

-- File Changes --

    M dom.bs (39)

-- Patch Links --

https://github.com/whatwg/dom/pull/656.patch
https://github.com/whatwg/dom/pull/656.diff

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