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Test Info:

<!doctype html>
<html>
<head>
<style>
button {
position:relative;
left:0px;
top:0px;
width:
200px;
height:100px;
border:none;
background:#00ff00;
-moz-appearance: none;
border-radius: 0 !important;
}
div {
position:absolute;
left:0px;
top:0px;
width:50px;
height:50px;
background:#ff0000;
}
</style>
</head>
<body>
<button><div></div></button>
</body>
</html>