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<!DOCTYPE html>
<title>CSS Backdrop Filters Animation: Opacity</title>
<link rel="author" href="mailto:masonf@chromium.org">


<style>
    .square {
        position: absolute;
        width: 100px;
        height: 100px;
        top: 100px;
        left: 100px;
        background: blue;
    }
    .greenbox {
        position: absolute;
        width: 50px;
        height: 50px;
        top: 125px;
        left: 125px;
        background: green;
    }
</style>
<p>You should see a blue square with a green box inside.</p>
<div class="square"></div>
<div class="greenbox"></div>