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Somehow I didn't remember clipboardchange at all, possibly because there are for example no wpts for it or anything. Especially "Actions that update the clipboard outside the user agent" part...
I'm not quite sure why we'd want to limit the feature to custom elements.
Having a way to bound to a tab might affect the API usage quite a bit. Needing to open a tab all the time even if the site was already...
Hmm, so overscroll would be dispatched where in this iframe case? Say top level page can be scrolled but iframe has been scrolled to top already and one tries to...
Is https://github.com/w3c/csswg-drafts/pull/4537 up-to-date to what has been discussed here?
If we are planning to change .source attribute handling to be similar to .relatedTarget, then this is fine (event would propagate if .target and .source are in different subtrees).
Once .source retargeting is sorted out.
Gecko has a variant of "event group", so called system event group, and listeners in that are called after the normal DOM event dispatch. (And it was also exposed to...
Gecko doesn't have such concept.
FWIW, I'm mostly concerned that the noopener part seems to be rather distinct feature. Coupling that with COOP feels weird.