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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test Reference</title>
<style>
body {
margin: 0;
}
div {
position: absolute;
top: 150px;
height: 100px;
}
#masked {
left: 150px;
width: 50px;
background: lime;
}
#blended {
left: 300px;
width: 100px;
background: rgb(0, 128, 0);
}
</style>
<div id="masked"></div>
<div id="blended"></div>