<!DOCTYPE html>
<title>CSS Backdrop Filters Animation: Blur Reference</title>
<link rel="author" href="mailto:masonf@chromium.org">
<style>
    .square {
        position: absolute;
        width: 100px;
        height: 100px;
        top: 100px;
        left: 100px;
        background: blue;
    }
    .filt {
        position: absolute;
        width: 200px;
        height: 200px;
        top: 50px;
        left: 50px;
        backdrop-filter: blur(10px);
    }
    .greenbox {
        position: absolute;
 