<!DOCTYPE html><!-- webkit-test-runner [ RequestIdleCallbackEnabled=true ] -->
<html>
<body>
<script>
function cb()
{
    let d = document;
    let p = d.createElement("p");
    p.innerText = "This shouldn't leak the document.";
    d.body.appendChild(p);
    window.requestIdleCallback(cb);
}

requestIdleCallback(cb);
parent.postMessage("iframeLoaded");
</script>
</body>
</html>