Test iframe from different origin can not access webkitFullscreenElement. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS document.webkitFullscreenElement is targetDiv1 PASS document.webkitCurrentFullScreenElement is targetDiv1 PASS message is "inner-iframe.html document.webkitFullscreenElement = null" PASS message is "inner-iframe.html document.webkitCurrentFullScreenElement = null" PASS successfullyParsed is true TEST COMPLETE