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http://fullscreen.spec.whatwg.org/#api [[ Let parentDocs be an ordered set consisting of doc's ancestor browsing context's documents with a fullscreen element stack consisting of one element (if any), in tree order. ]] This will simply exclude a document in the middle of the document chain with more than one elements on its stack, causing resize to be set to true incorrectly. It's probably safest to populate it with an explicit loop like exitDocs, possibly in a helper function to guarantee that they are in sync.
https://github.com/whatwg/fullscreen/commit/36713f80c936d191d3e375acc7c6fd4456bb282c
LGTM