<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head> <title> CSS Values and Units Test: Viewport units are interpolated correctly </title> <meta content=" The interpolated size mid-way between 0px and 200vh is 100vh (respectively for vw) " name="assert" /> <link href="mailto:fremycompany.developer@yahoo.fr" rel="author" title="François REMY" /> <link href="http://www.w3.org/TR/css3-values/#viewport-relative-lengths" rel="help" /> <link href="http://www.w3.org/TR/css3-animations/#animations" rel="help" /> <link href="reference/all-green.xht" rel="match" /> <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>