Re: [whatwg/dom] Add window.event, event.srcElement, event.returnValue as a legacy compat requirements (#407)

@annevk I guess HTML is already overloading `returnValue` on `BeforeUnloadEvent`, right? Do we need to do anything more to call that out?

https://html.spec.whatwg.org/multipage/browsers.html#the-beforeunloadevent-interface

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