Re: [whatwg/fullscreen] Reinstate the hierarchy restrictions (#91)

Sadly, Gecko still doesn't have `dialog`... so this is not applicable.

I don't recall exactly what the problems are for that...

It seems one of the problem would be that `showModal` may be called on a dialog element which is already a fullscreen element?

For that, I would probably prefer the second way, specifically, we pop out fullscreen elements until the dialog is no longer a fullscreen element, and then we add the element back as a dialog.

But thinking about this a bit further, this option is probably unnecessarily complicated, because that means we would need to consider dispatching event, and even unfullscreen the window, for a `showModal` call, which sounds unfortunate.

Given this, I guess we should make HTML avoid invoking top-layer-add when the element is already a fullscreen element by rejecting it with a exception, and I think we should assert in top-layer-add that the element to be append is not currently an element in the top layer.

If we add that assertion, we would also need to think about what if a modal dialog requests fullscreen. Maybe we should reject as well. I don't think those cases are common, and I don't have idea how authors may find those cases useful...

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