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.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;
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>