didBecomeFullscreenElement  408 Source/core/dom/Element.h     virtual void didBecomeFullscreenElement() { }
didBecomeFullscreenElement  406 Source/core/dom/FullscreenElementStack.cpp     m_fullScreenElement->didBecomeFullscreenElement();
didBecomeFullscreenElement  308 Source/core/html/HTMLMediaElement.h     virtual void didBecomeFullscreenElement() OVERRIDE FINAL;