My understanding is that we could leave it after our 1st ship, mark P3 for now. Feel free to correct me if I'm wrong.

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Comment on attachment 8947933 [details] [diff] [review] shadowdom_fullscreen.diff Review of attachment 8947933 [details] [diff] [review]: ----------------------------------------------------------------- ::: dom/base/nsDocument.cpp @@ +11174,5 @@ > DispatchFullscreenError("FullscreenDeniedSubDocFullScreen"); > return false; > } > + //XXXsmaug Note, we don't follow the latest fullscreen spec here. > + // This whole check could be probably removed. Is there a bug filed for this? Looking at the spec, this should basically just become an IsInComposedDoc?

There isn't, since after discussing with xidorn, it isn't even clear whether the spec will stay the way it is now, or whether it should be reverted to follow what implementations actually do.

In other words, the spec situation is messy.

Hmm, looks like there is still some assertion to fix.

(In reply to Olli Pettay [:smaug] from comment #4) > There isn't, since after discussing with xidorn, it isn't even clear whether > the spec will stay the way it is now, or whether it should be reverted to > follow what implementations actually do. I think the editor and I have consensus that we would revert the spec back to match impls on having hierarchy restriction. It is just that he doesn't have time to do the actual edit and work on related tests lately...

Just fixing IsInUncomposedDoc -> IsInComposedDoc in an NS_ASSERTION and rebasing

Pushed by opettay@mozilla.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/0babcbf5ff1e Implement ShadowRoot.fullscreenElement , r=mrbkap

As before, I've updated the docs to show this property as implemented on DocumentOrShadowRoot (but with the browser compat data saying it is still implemented on Document in most places): https://developer.mozilla.org/en-US/docs/Web/API/Document https://developer.mozilla.org/en-US/docs/Web/API/DocumentOrShadowRoot https://developer.mozilla.org/en-US/docs/Web/API/DocumentOrShadowRoot/fullscreenElement