[w3c/uievents] Mismatch definition for `beforeinput` with `w3c/editing` (#85)

`w3c/uievents` says
> 5.5.3.1. beforeinput
> A user agent MUST dispatch this event when the DOM is about to be updated.

But `w3c/editing` says
> A user agent must dispatch this event when the user has attempted to input in a contenteditable 
> element. It does not necessarily mean the user agent will then update the DOM.

Is there a case that the user might attempted to input but failed? For example empty stack for `undo`/`redo`?

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