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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>Dynamic change to paint containment (reference)</title>
<style>
#container {
width: 100px;
height: 100px;
background: green;
contain: paint;
}
#overflowing {
width: 400px;
height: 100px;
}
.square {
display: inline-block;
width: 50px;
height: 50px;
margin: 5px;
}
.red {
background: red;
}
</style>
<body>
<p>PASS if you see a green square and no red.</p>
<div id="container">
<div id="overflowing"><div class="square"></div><div class="square"></div><div class="red square"></div></div>
</div>
</body>
</html>