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<!DOCTYPE html>
<html>
<head>
<style>
#t { background: green; position: absolute; width: 100%; left: 0;
height: 10px; top: 0; }
</style>
</head>
<body>
<div style="position: relative; display: inline; color: white; background: white;">ABCDEF<div id="t"></div></div>
<body>
</html>