LayoutTests/css3/masking/clip-path-polygon-viewport-units.html - WebKit - Git at Google

 <!DOCTYPE html>
 <style>
     .clip {
         width: 40vw;
         height: 40vw;
         background-color: blue;
         -webkit-clip-path: polygon(10vw 10vw, 30vw 10vw, 30vw 30vw, 10vw 30vw);
     }
 </style>
 <body>
     <div class="clip"></div>
 </body>
	<!DOCTYPE html>
	<style>
	.clip {
	width: 40vw;
	height: 40vw;
	background-color: blue;
	-webkit-clip-path: polygon(10vw 10vw, 30vw 10vw, 30vw 30vw, 10vw 30vw);
	}
	</style>
	<body>
	<div class="clip"></div>
	</body>