[whatwg/dom] Shadow: Add a hook for retargeting other attributes (#288)

Fix #286. Add the minimum hook to an event dispatch so other
specifications, such as TouchEvents spec, can retarget the event's
attributes, before invoking an event.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/288

-- Commit Summary --

  * Shadow: Add a hook for retargeting other attributes

-- File Changes --

    M dom.bs (11)
    M dom.html (94)

-- Patch Links --

https://github.com/whatwg/dom/pull/288.patch
https://github.com/whatwg/dom/pull/288.diff

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