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<!DOCTYPE html>
<style>
body {
transform: translateZ(0);
}
#container {
height: 300px;
width: 300px;
background-color: green;
transform: translateZ(0);
}
#parent {
position: absolute;
left: 400px;
width: 300px;
height: 300px;
background-color: green;
-webkit-transform-style: preserve-3d;
}
#child {
position: absolute;
width: 200px;
height: 200px;
z-index: -2;
background-color: red;
transform: translateZ(0);
}
</style>
<body>
<div id="container">
<div id="parent">
<div id="child"></div>
</div>
</div>
<script>
if (window.testRunner)
testRunner.waitUntilDone();
requestAnimationFrame(function() {
requestAnimationFrame(function() {
document.getElementById('parent').style.webkitTransformStyle = 'flat';
setTimeout(function() {
testRunner.notifyDone();
});
});
});
</script>
</body>
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