<script>
if (window.testRunner)
    testRunner.waitUntilDone();
</script>
<style>
@keyframes frames {
    from { transform: translate(-10px, -10px)  }
    to { transform: rotate(-90deg)  }
}
div { animation: frames 0.1s forwards }
</style>
<div onanimationend="if (window.testRunner) testRunner.notifyDone()">This should animate sideways</div>