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+<!--
+ Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+ <style>
+ .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;
+ }
+ </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>
+</body>
+</html>