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http://fullscreen.spec.whatwg.org/#dom-element-requestfullscreen Can pending's top-level browsing context's document's viewport change after the async return? I don't think so, and in order to fix 26601 the pending variable would have to be kept across the async boundaries, so one might just as well use that directly.
Bug 26601.
https://github.com/whatwg/fullscreen/commit/490a45a82bed742bdfbbd4628140b1aaecad69ac
LGTM