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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>
CSS Values and Units Test:
Viewport units are supported inside calc expressions.
</title>
<meta name="assert" content="
Check that viewport units add correctly to percentages in calc() expressions
" />
<link
rel="author"
title="François REMY"
href="mailto:fremycompany.developer@yahoo.fr"
/ >
<link
rel="match"
href="reference/all-green.html"
/>
<style type="text/css">
html, body { margin: 0px; padding: 0px; }
html { background: red; }
#target { position: absolute; background: green; width: calc(100vw + 50%); height: calc(100vh + 50%); top: -50%; left: -50%; }
</style>
</head>
<body>
<div id="target"></div>
</body>
</html>