[whatwg/dom] Added a duplicate attribute present member to element (#721)

Issue: https://github.com/whatwg/html/issues/3257

Added a `duplicate attribute present` member to `Element`
Modified create an element algorithm to accept a `duplicate attribute present` flag to save it on the `Element`
This will be used in https://w3c.github.io/webappsec-csp/#is-element-nonceable.

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

  https://github.com/whatwg/dom/pull/721

-- Commit Summary --

  * Added a duplicate attribute present member to element

-- File Changes --

    M dom.bs (35)

-- Patch Links --

https://github.com/whatwg/dom/pull/721.patch
https://github.com/whatwg/dom/pull/721.diff

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