third_party/WebKit/LayoutTests/fast/css/containment/paint-containment-with-box-shadow.html - chromium/src - Git at Google

 <!DOCTYPE html>
 <style>
 div {
     width: 100px;
     height: 100px;
 }
 #container {
     contain: paint;
 }
 #child {
     background-color: green;
     -webkit-box-shadow: 0 0 100px 100px red;
 }
 </style>
 <body>
 <div id="container"><div id="child"></div></div>
	<!DOCTYPE html>
	<style>
	div {
	width: 100px;
	height: 100px;
	}
	#container {
	contain: paint;
	}
	#child {
	background-color: green;
	-webkit-box-shadow: 0 0 100px 100px red;
	}
	</style>
	<body>
	<div id="container"><div id="child"></div></div>