<!DOCTYPE html>
<html>
<head>
<style>
#target {
width: 100px;
height: 100px;
background-color: black;
}
</style>
</head>
<body>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<div id="target"></div>
<script>
function waitNFrames(numberOfFrames, continuation)
{
let elapsedFrames = 0;
(function rAFCallback() {
if (elapsedFrames++ >= numberOfFrames)
continuation();
else
requestAnimationFrame(rAFCallback);
})();
async_test(t => {
const target = document.getElementById("target");
target.animate({ transform: ["translateX(100px)", "none"] }, 1000 * 1000);
waitNFrames(3, () => {
const initialAnimations = internals.acceleratedAnimationsForElement(target);
assert_equals(initialAnimations.length, 1, "There should be a single accelerated animation before suspension.");
assert_object_equals(initialAnimations[0], { property: "transform", speed: 1 },
'The single accelerated animation before suspension should be running and targeting the "transform" property.');
internals.suspendAnimations();
waitNFrames(2, () => {
const suspendedAnimations = internals.acceleratedAnimationsForElement(target);
assert_equals(suspendedAnimations.length, 1, "There should be a single accelerated animation after suspension.");
assert_object_equals(suspendedAnimations[0], { property: "transform", speed: 0 },
'The single accelerated animation after suspension should be paused and targeting the "transform" property.');
internals.resumeAnimations();
setTimeout(() => t.done());
});
}, "Suspending animations should pause running accelerated animations.");
</script>
</body>
</html>
