[whatwg/dom] Add onabort definition and add onslotchange (#785)

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

  https://github.com/whatwg/dom/pull/785

-- Commit Summary --

  * Define the onabort event handler IDL attribute
  * Define the onslotchange event handler IDL attribute

-- File Changes --

    M dom.bs (14)

-- Patch Links --

https://github.com/whatwg/dom/pull/785.patch
https://github.com/whatwg/dom/pull/785.diff

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