Re: [fullscreen] `position` value of `::backdrop` pseudo-element (#27)

Probably not completely a duplicate? If we do
> It, ~~and its ::backdrop pseudo-element,~~ are not rendered if its inclusive ancestor has the display property set to none.

Then it is not clear whether the pseudo-element should be rendered if the top layer element has `display: none`, because `::backdrop` doesn't seem to be a descendant of the element, does it?

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