Re: [w3c/editing] Expose event.getTargetRanges() in oncompositionstart (and possibly oncompositionend as well) (Issue #511)

masayuki-nakano left a comment (w3c/editing#511)

The event source of composition events are IME and DOM Selection. On the other hand, the event source of `beforeinput` event is the builtin editor and its managing DOM tree and DOM Selection. Therefore, I don't think it's reasonable to add `getTargetRanges` to composition events.

On the other hand, if IME wants to replace existing text, I think browsers should select the range with DOM Selection before `compositionstart`. I think Firefox does it. The other browsers do not do that? If they do it, DOM Selection range which you can check from a `compositionstart` is what you want.

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