[w3c/uievents] onbeforeinput (#218)

Hey,

as far as I can tell, there should be a onbeforeinput IDL attribute [1]. If we don't have this, I don't see how we can do feature detection of the beforeinput event, which now turns out to be a problem in Firefox [2].

[1] https://w3ctag.github.io/design-principles/#always-add-event-handlers

[2] https://github.com/w3c/input-events/issues/30#issuecomment-452584877

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