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<!DOCTYPE html>
<title>CSS Backdrop Filters Animation: Drop Shadow</title>
<link rel="author" href="mailto:masonf@chromium.org">
<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
<link rel="match" href="css-backdrop-filters-animation-drop-shadow-ref.html">
<style>
@keyframes animate {
0% {
backdrop-filter: drop-shadow(30px 30px 0px black);
}
100% {
backdrop-filter: none;
}
}
.square {
position: absolute;
width: 100px;
height: 100px;
top: 100px;
left: 100px;
background: blue;
}
.filt {
position: absolute;
width: 200px;
height: 200px;
top: 50px;
left: 50px;
animation-name: animate;
animation-play-state: paused;
animation-delay: -2s;
animation-duration: 4s;
animation-timing-function: linear;
}
.greenbox {
position: absolute;
width: 50px;
height: 50px;
top: 75px;
left: 75px;
background: green;
}
</style>
<p>You should see a blue rectangle in top of a gray one, with a green box on top.</p>
<div class="square"></div>
<div class="filt">
<div class="greenbox"></div>
</div>
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