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Test Info:

Any copyright is dedicated to the Public Domain.
.parent {
With the darken blend mode, green will overwrite white parts of this
background, while black parts of this background will show through.
background: linear-gradient(#fff 0%, #fff 50%, #000 50%, #000 100%);
width: 100px;
height: 100px;
.child {
filter: blur(3px);
mix-blend-mode: darken;
background: #0f0;
width: 100px;
height: 100px;
You should see a blurred green square, with its bottom half mostly
covered by a black rectangle.
<div class="parent">
<div class="child"></div>