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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<style>
.ref {
width: 100px;
height: 150px;
background: green;
}
</style>
</head>
<body>
<p>Test passes if there is a filled green rectangle and <strong>no red</strong>.</p>
<div class="ref"></div>
</body>
</html>