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<!DOCTYPE html>
<meta charset="utf-8">
CSS Values and Units Test:
Viewport units are interpolated correctly
<meta name="assert" content="
The interpolated size mid-way between 0px and 200vh is 100vh (respectively for vw)
" />
title="François REMY"
/ >
<link rel="help" href=""/>
<link rel="help" href=""/>
<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; }
<div id="outer"></div>