<!DOCTYPE html>
<html>
<head>
<style type="text/css" media="screen">
body {
background-color: silver;
padding: 10px;
}
.container {
position: absolute;
height: 100px;
width: 100px;
margin: 10px;
left: 0;
top: 0;
z-index: -1;
background-color: blue;
}
.compositing {
will-change: transform;
}
</style>
</head>
<body>
<!-- the body background should cover the entire viewport. No red should be visible in debug builds. -->
<div class="container">
<div class="compositing">
Compositing
</div>
</div>
</body>
</html>