The use counter for this is https://www.chromestatus.com/metrics/feature/timeline/popularity/863 which is very, very low.

What other browsers support it? I would say that if it's already implemented everywhere we should just spec it, but if it's missing from any engine we can try removal instead.

foolip, could you do the research to make a decision about whether to standardize or remove?

yosin, if we were going to remove this, should your team work on it or input?

It looks like all engines support initCompositionEvent, so despite the very low usage I think standardizing the arguments is the best option. Gecko has an extra argument at the end, but we can probably ignore that.

I have filed https://github.com/w3c/uievents/issues/134

Remove Blink>DOM>Events

Unassigning as I'm not really working on this. Also changed away from ExternalDependency, because even though a spec change is needed, I don't think anything https://github.com/w3c/uievents/issues/134 is going to make any progress without someone working on this bug pushing for it, so let's just treat it as part of this bug.