css-values-3/vh-support-atviewport.html

<!DOCTYPE html>
<html>
<head>
	
	<title>
		CSS Values and Units Test: 
		Viewports units are supported in @viewport rules
	</title>
	<meta name="assert" content="
		Viewports units are supported in @viewport rules
	" />
	
	<link 
		rel="author" 
		title="François REMY" 
		href="mailto:fremycompany.developer@yahoo.fr"
	/>

	<link rel="help" href="http://www.w3.org/TR/css3-values/#viewport-relative-lengths" />
	<link rel="help" href="http://dev.w3.org/csswg/css-device-adapt/" />

	<link 
		rel="match" 
		href="reference/all-green.html"
	/>
	
	<style type="text/css">
		
			html, body { margin: 0px; padding: 0px; overflow: hidden; }
			
			@viewport { width: 1vw; }
			
			html { background: red; }
			#target { background: green; width: 100vw; height: 100vh; }
			
	</style>
	
</head>
<body>

	<div id="target"></div>

</body>
</html>