<!DOCTYPE html>
<html>
<head>
<style>

#target {
    width: 100px;
    height: 100px;
    background-color: black;
    transition: transform 10ms;
}

</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 => {
    requestAnimationFrame(() => {
        const target = document.getElementById("target");
        target.style.transform = "translate3d(100px, 0, 0)";
        target.getAnimations()[0].finished.then(() => {
            waitNFrames(2, () => {
                assert_equals(internals.acceleratedAnimationsForElement(target).length, 0, "There should be no accelerated animation after the animation completed.");
                t.done();
            });
        });
    });
}, "An accelerated CSS transition should remove its animation upon completion.");

</script>
</body>
</html>