Re: [w3c/webcomponents] Document "layers" for single-use components (#806)

So something like a tooltip would need to be in the top layer but not in the blocking elements stack.  You generally want it on top of everything else but to keep focus on whatever you had it on, or for it to disappear when the mouse is no longer interacting with the bound element, for example.  A context menu might go on the blocking elements stack, however, so that users can click away from it to dismiss it without interacting with another element on the page.

Does the proposal for blocking elements stack allow you to add a previously unconnected element to the stack? I think this would be particularly handy for third-party scripts.

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