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In 6.6.1 "Navigating across documents", in the algorithm for 'navigated', in step 23, under "Creating a new Document object", step 4 says: If the Document's browsing context has a browsing context container and it is either not an iframe element, or it does not have the allowfullscreen attribute specified, or its Document does not have the fullscreen enabled flag set, then ... Grammatically speaking, the "either" is misplaced (because each "or" is followed by a clause, but "either" isn't). Change "it is either" to "either it is".