Tools/LayoutReloaded/test/margin-collapse-simple.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
 <head>
 <style>
 body {
     margin: 0px;
     padding: 8px;
 }
 </style>
 </head>
 <body>
     <div style="margin: 20px; width: 20px; height: 20px;">
         <div style="margin-top: 20px; width: 20px; height: 20px;"></div>
     </div>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<style>
	body {
	margin: 0px;
	padding: 8px;
	}
	</style>
	</head>
	<body>
	<div style="margin: 20px; width: 20px; height: 20px;">
	<div style="margin-top: 20px; width: 20px; height: 20px;"></div>
	</div>
	</body>
	</html>