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Test Info:

<!DOCTYPE html>
<html>
<head>
<title>Test for bug 806583</title>
<style>
body, div { background: blue }
div { position: fixed; }
</style>
</head>
<body>
<input id="input">
<div id="cover"/>
<script>
var rect = document.getElementById("input").getBoundingClientRect();
var cover = document.getElementById("cover");
cover.style.left = rect.left + "px";
cover.style.top = rect.top + "px";
cover.style.width = rect.width + "px";
cover.style.height = rect.height + "px";
</script>
</body>
</html>