elementsFromPoint behavior is unclear

[smaug----]

Per spec ShadowRoot.elementsFromPoint may return an array which contains host element several times, since retargeting is done for each elements in the result array.

[hayatoito]

FYI. There is an issue filed for csswg: w3c/csswg-drafts#556

I remember that Blink recently tried to fix the broken behavior in https://chromium-review.googlesource.com/c/chromium/src/+/808446.

Per spec ShadowRoot.elementsFromPoint may return an array which contains host element several times, since retargeting is done for each elements in the result array.

That sounds fair argument.

@TakayoshiKochi @rakina WDYT? Does blink return an array which has several same elements for elementsFromPoint?

[rakina]

Right now elementsFromPoint doesn't return multiple identical elements (https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/dom/TreeScope.cpp?sq=package:chromium&l=276)

[smaug----]

Yeah, it doesn't and Gecko won't either, but per spec it should. So implementing the API is guess work atm.

[rniwa]

Closing this in favor of #736