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+<!DOCTYPE html>
+<html>
+<head>
+	<meta charset="utf-8">
+	<title>
+		CSS Values and Units Test:
+		Viewport units are interpolated correctly
+	</title>
+	<meta name="assert" content="
+		The interpolated size mid-way between 0px and 200vh is 100vh (respectively for vw)
+	" />
+
+	<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://www.w3.org/TR/css3-animations/#animations"/>
+
+	<link
+		rel="match"
+		href="reference/all-green.html"
+	/>
+
+	<style type="text/css">
+
+			@keyframes anim {
+				from { width: 0px; height: 0px; }
+				to   { width: 200vw; height: 200vh; }
+			}
+
+			html, body { margin: 0px; padding: 0px; }
+
+			html { background: red; overflow: hidden; }
+			#outer { position: relative; background: green; }
+			#outer { animation: anim 2000000s; animation-delay: -1000000s; }
+
+	</style>
+
+</head>
+<body>
+
+	<div id="outer"></div>
+
+</body>
+</html>