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chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/backdrop-filter-basic-background-color-ref.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>backdrop-filter: Basic operation of filter with background color</title>
<link rel="author" href="mailto:[email protected]">



<div>
  <p>Expected: A green box and an overlapping blue box, with a purple<br>
  overlapping region.</p>
</div>
<div class="colorbox"></div>
<div class="box2outside"></div>
<div class="box2inside"></div>

<style>
.colorbox {
    position: absolute;
    background: green;
    width: 100px;
    height: 100px;
    left: 10px;
    top: 100px;
}
.box2outside {
    background: #000088;
    position: absolute;
    width: 100px;
    height: 100px;
    left: 60px;
    top: 150px;
}
.box2inside {
    background: #773bff;
    position: absolute;
    width: 50px;
    height: 50px;
    left: 60px;
    top: 150px;
}
</style>