1 EVENT(webkitfullscreenchange)
2 EXPECTED (document.webkitIsFullScreen == 'true') OK
3 EXPECTED (document.webkitCurrentFullScreenElement == '[object HTMLSpanElement]') OK
4 EVENT(webkitfullscreenchange)
5 EXPECTED (document.webkitIsFullScreen == 'false') OK
6 EXPECTED (document.webkitCurrentFullScreenElement == 'undefined') OK