Test locking an element not in a document is rejected and pointerlockerror event dispatched. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS targetDiv1.parentElement is not null Remove targetDiv1 from document, and try to lock it. PASS targetDiv1.parentElement is null PASS onpointerlockerror received after: Remove targetDiv1 from document, and try to lock it. PASS successfullyParsed is true TEST COMPLETE