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<!DOCTYPE html>
<html>
<head>
<style>
#fixed1, #fixed2 {
background-color: silver;
}
</style>
<script type="text/javascript">
if (window.testRunner && window.internals) {
testRunner.dumpAsText();
internals.settings.setAcceleratedCompositingForFixedPositionEnabled(true);
internals.settings.setFixedPositionCreatesStackingContext(true);
addEventListener("load", function() {
document.getElementById("layerTree1").innerText = internals.layerTreeAsText(document);
document.getElementById("fixed1").style.top = "50px";
document.getElementById("fixed2").style.height = "10px";
document.getElementById("layerTree2").innerText = internals.layerTreeAsText(document);
document.getElementById("fixed1").style.top = "-100px";
document.getElementById("fixed2").style.height = "0px";
document.getElementById("layerTree3").innerText = internals.layerTreeAsText(document);
}, 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;">
Layer tree when the fixed elements are out-of-view (should be blank):
<pre id="layerTree1"></pre>
Layer tree when the fixed elements are in-view (both fixed elements should have layers):
<pre id="layerTree2"></pre>
Layer tree when the fixed elements are out-of-view again (should be blank):
<pre id="layerTree3"></pre>
<div id="fixed1" style="position: fixed; top: -100px; left: 100px; width: 10px; height: 10px"></div>
<div id="fixed2" style="position: fixed; top: 100px; left: 100px; width: 10px; height: 0px"></div>
</body>
</html>
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