DocumentOrShadowRoot-prototype-elementFromPoint.html relies on undefined behavior or is just buggy

[smaug----]

See for example
WICG/webcomponents#735
WICG/webcomponents#736

https://wpt.fyi/shadow-dom

as far as I see, per current spec at least all the
'document.elementFromPoint and shadow.ElementFromPoint must return the shadow host of the hit-tested text node when the hit-tested text node is a direct child of the root and the host has display...'
and also others.

[gsnedders]

cc/ @rakina

[rakina]

Hi, that test is based on this test from webkit and W3C editor's draft on https://w3c.github.io/webcomponents/spec/shadow/#extensions-to-the-documentorshadowroot-mixin. Should it not be in WPT?

[smaug----]

Sure it should be tested, but the spec is vague, and the tests don't even follow the spec.
(well, the spec is vague enough, that it is hard to know what the expected test results should be)

[smaug----]

FWIW, Nightly Gecko will get the same test results as Blink, since that is my current interpretation of the spec.

[smaug----]

ahaa, there is w3c/csswg-drafts#556