[whatwg/dom] Add attribute validate steps on top of #805. (#809)

See #789 for the background.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/809

-- Commit Summary --

  * Editorial: embrace that attributes are objects
  * remove asserts and fix error
  * Add support for attribute validate steps before attribute mutation.

-- File Changes --

    M dom.bs (217)

-- Patch Links --

https://github.com/whatwg/dom/pull/809.patch
https://github.com/whatwg/dom/pull/809.diff

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