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http://fullscreen.spec.whatwg.org/#dom-element-requestfullscreen "If error is false: While the first element in fullscreenElements ..." is preceded by "If either error is true ... terminate these steps."
Guess I only made this change in my head. https://github.com/whatwg/fullscreen/commit/ec041f87deb2501b73383bb6d9ebae46026fdc29