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<!--
Any copyright is dedicated to the Public Domain.
-->
<!DOCTYPE HTML>
<html>
<head>
<style>
.parent {
position: relative;
width: 100px;
height: 100px;
}
.child {
filter: blur(3px);
background: #0f0;
width: 100px;
height: 100px;
}
.black-rect {
position: absolute;
top: 50px;
width: 100px;
height: 50px;
background: #000;
}
</style>
</head>
<body>
<!--
You should see a blurred green square, with its bottom half mostly
covered by a black rectangle.
-->
<div class="parent">
<div class="child"></div>
<div class="black-rect"></div>
</div>
</body>
</html>