<!DOCTYPE html>
<html>
<head>
<style>
#willChangeTop {
will-change: top;
position: absolute;
left: 200px;
top: 100px;
width: 100px;
height: 100px;
background-color: blue;
color: white;
}
#willChangeTransform {
will-change: -webkit-transform;
position: absolute;
left: 200px;
top: 300px;
width: 100px;
height: 100px;
background-color: blue;
color: white;
}
.fixed {
position: fixed;
left: 50px;
top: 50px;
width: 75px;
height: 75px;
background-color: green
}
</style>
</head>
<body>
This test verifies that "will-change: -webkit-transform" creates a containing
block for fixed position descendants, and that other values of will-change do
not create such a containing block.
<div id="willChangeTop">
will-change: top
<div class="fixed"></div>
</div>
<div id="willChangeTransform">
will-change: -webkit-transform
<div class="fixed"></div>
</div>
</body>
</html>