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Previously the documents would notified from the top-level document and down, now it is the other order. The former order was sensible, so change "append" to "prepend" in "While the last element in fullscreenElements is in a nested browsing context, append its browsing context container to fullscreenElements."
Isn't that preserved by iterating from last to first? But using prepend is probably clearer.
https://github.com/whatwg/fullscreen/commit/550dc005ba07cb098c761b115f891c4099218392
Oh, I missed the "from last to first" bit.