
PASS Setting a null effect on a running animation fires an animationend event 
PASS Replacing an animation's effect with an effect that targets a different property should update both properties 
PASS Replacing an animation's effect with a shorter one that should have already finished, the animation finishes immediately 
PASS A play-pending animation's effect whose effect is replaced still exits the pending state 
PASS The event is dispatched at the original element even after setting an effect with a different target element 
PASS After replacing a finished animation's effect with a longer one it fires an animationstart event