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<!DOCTYPE html>
<html><head>
<meta charset="utf-8">
<title>
CSS Reftest Reference
</title>
<link href="mailto:fremycompany.developer@yahoo.fr" rel="author" title="François REMY">
<style type="text/css">
html
{
background-color: yellow;
border-left: blue solid 50vw;
height: 100vh;
}
</style>
</head>
<body>
</body></html>