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<!DOCTYPE html>
<title>Retargeted CSS transition</title>
<link rel="help" href="https://www.w3.org/TR/css-transitions-1/#starting">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="element">x</div>
<style>
#element {
transition: transform 2000ms;
transition-timing-function: linear;
}
</style>
<script>
promise_test(function(t) {
element.offsetTop; // Force recalc
element.style.transform = "rotateX(180deg)";
element.offsetTop; // Force recalc
assert_equals(element.getAnimations().length, 1, 'Transition creates an animation');
var animation = element.getAnimations()[0];
return animation.ready.then(function() {
assert_equals(element.getAnimations().length, 1, 'No new animations yet');
assert_equals(element.getAnimations()[0], animation);
element.style.transform = "rotateX(360deg)";
element.offsetTop; // Force recalc
assert_equals(element.getAnimations().length, 1, 'Retargeting transition results in only one animation');
var newAnimation = element.getAnimations()[0];
assert_not_equals(newAnimation, animation);
});
}, 'Retargeting a transition should cause the old transition to be cancelled');
</script>
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