<script>
    if (window.testRunner) {
        window.testRunner.dumpAsText();
    }
    function eventhandler() {
        var animation = element.animate({ "padding-left": [0, 1] }, 0.5);
        animation.reverse();
        animation.effect = null;
    }
    window.requestAnimationFrame(eventhandler);
</script>
<body>
    <div id="element"></div>
    <p>Ensure removing the effect from an active animation is handled correctly.</p>
    <p>PASS if test does not crash.</p>
</body>