[whatwg/dom] Add class as an alias for className (PR #1311)

This adds class as an alias for className to be
more consistent and intuitive. This is now possible since 'class' is no longer a globally reserved word in Javascript.

fixes #1310

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1311

-- Commit Summary --

  * Add class as an alias for className

-- File Changes --

    M dom.bs (8)

-- Patch Links --

https://github.com/whatwg/dom/pull/1311.patch
https://github.com/whatwg/dom/pull/1311.diff

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