I think we'd need strong proof of a frame pointer in content nodes being worht the cost, but a bit for this we can afford. We've got mFlagsOrSlots in nsGenericElement, we can shave a bit off of GENERIC_ELEMENT_CONTENT_ID_MASK and use that for knowing if there might be a frame for this element or not.
Ah, excellent. That sounds good.
Does this matter much for XUL?
It doesn't, as far as I can tell.
What would be a reasonable nsIContent api for this?
void SetHasFrame(PRBool aHasFrame); PRBool MayHaveFrame();
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