Re: [whatwg/dom] cancelBubble legacy property (#211)

> it sounds like we don't even know for sure that removing cancelBubble completely would be incompatible

We do know that supporting "selectstart" events as `Event` but not having `cancelBubble` on `Event` breaks the ability to select text in emails in Outlook Web Access.  See https://bugzilla.mozilla.org/show_bug.cgi?id=1280534#c33

Note that either I messed up debugging the Firefox side there or OWA is actually attaching different listeners or creating a different DOM depending on whether `cancelBubble` is on Event or something...  It's not entirely clear what exactly is happening there (e.g. Chrome running against a version of the page saved in Firefox never reaches the `cancelBubble` codepath).  But certainly moving `cancelBubble` to `Event` makes whatever insanity OWA is involved in work.

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