<!DOCTYPE html>
<html>
<head>
<style>
.fixed {
position: fixed;
width: 10px;
height: 10px;
top: -100px;
background-color: silver;
}
</style>
<script type="text/javascript">
if (window.testRunner && window.internals) {
testRunner.dumpAsText();
internals.settings.setPreferCompositingToLCDTextEnabled(true);
addEventListener("load", function() {
var fixed = document.createElement("div");
document.body.appendChild(fixed);
document.body.offsetHeight;
fixed.className = "fixed";
var mainThreadScrollingReasons = internals.mainThreadScrollingReasons(document);
document.getElementById("result").innerText = !mainThreadScrollingReasons ? "PASS" : "FAIL: " + mainThreadScrollingReasons;
testRunner.notifyDone();
}, false);
}
</script>
</head>
<!-- Fixed position elements may skip compositing without a scrollable
ancestor. To make sure this test covers the intended scenario, we force the
body element to be tall, so that the FrameView is scrolling. -->
<body style="height: 4000px;">
<pre id="result"></pre>
</body>
</html>