
PASS When an event is created, returnValue should be initialized to true. 
PASS preventDefault() should not change returnValue if cancelable is false. 
PASS returnValue=false should have no effect if cancelable is false. 
PASS preventDefault() should change returnValue if cancelable is true. 
PASS returnValue should change returnValue if cancelable is true. 
PASS initEvent should unset returnValue. 
FAIL returnValue=true should have no effect once the canceled flag was set. assert_true: expected true got false