<!DOCTYPE HTML>
<style>
body {
transform: translateZ(0);
}
#overlapper {
width: 400px;
height: 400px;
left: 200px;
background: gray;
position: absolute;
transform: translateZ(0);
}
#container {
-webkit-perspective: 1400px;
transform: translateZ(0);
position: absolute;
width: 180px;
height: 180px;
background: papayawhip;
}
#composited {
width: 100px;
height: 100px;
background: green;
position: absolute;
transform: translateZ(10px);
}
#squashed {
position: absolute;
left: 200px;
width: 50px;
height: 50px;
background: blue;
}
</style>
<div id="overlapper"></div>
<div id="container">
<div id="composited"></div>
</div>
<div id="squashed"></div>