<style>
#target { width:100px; height:100px; left:100px; top:100px; background-color:green }
</style>
<span id=target></span>
<script>
async function test() {
    if (window.testRunner)
        testRunner.waitUntilDone();

    var positionAnimation = [
        { position: 'static' },
        { position: 'absolute' },
    ];
    var positionTiming = {
        duration: 16,
        fill: 'forwards'
    };
    const animation = target.animate(positionAnimation, positionTiming);
    await animation.finished;

    if (window.testRunner)
        testRunner.notifyDone();
}
test();
</script>