[Webkit-unassigned] [Bug 84796] Implement the new stacking layer needed by the Fullscreen API and the new <dialog> element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=84796





--- Comment #2 from Matt Falkenhagen <falken at chromium.org>  2012-09-11 02:01:22 PST ---
I've been looking at the specs to try to figure out the requirements for the top layer.

My understanding is that the top layer can have multiple fullscreen elements and multiple dialogs. Due to requestFullscreen() restrictions, the fullscreen elements on the top layer must be an ancestor chain (the topmost element is the leaf descendant). Typically, you won't see other fullscreened ancestors since the default ::backdrop is a black box covering the whole viewport. But with a custom backdrop style, the ancestors may be visible. However, there is no double rendering of an element: the containing block of each element in the top layer is the initial containing block.

I'm not sure if the current Fullscreen implementation supports rendering multiple fullscreen elements. It might just render the topmost fullscreen element and black out the rest of the screen. So that would have to change to render all elements in the top layer including ::backdrops.

Maybe a good plan would be to first try to get top layer working for the Fullscreen API, then add support for dialog. This is because if we implement it for dialog first, we might end up with something difficult to get to work with the current Fullscreen implementation.

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