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<!doctype html>
<meta charset="utf-8">
<title>Corner Clipped Background Color</title>
<style>
html {
background-color: green;
}
#a {
top: 20px;
left: 20px;
position: absolute;
width: 20px;
height: 20px;
background-color: black;
}
</style>
<div id="a"></div>