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<!DOCTYPE html>
<title>CSS Backdrop Filters: Grayscale(50%)</title>
<link rel="author" href="mailto:masonf@chromium.org">
<link rel="help" href="https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty">
<link rel="help" href="https://drafts.fxtf.org/filter-effects-1/#supported-filter-functions">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=831485">
<link rel="match" href="reference/backdrop-filters-grayscale-001-ref.html">
<meta name="assert" content="Check that backdrop-filter works with grayscale(50%)."/>
<style>
.square {
position: absolute;
width: 100px;
height: 100px;
top: 100px;
left: 100px;
background: blue;
}
.filt {
backdrop-filter: grayscale(50%);
position: absolute;
width: 200px;
height: 200px;
top: 50px;
left: 50px;
}
.greenbox {
position: absolute;
width: 50px;
height: 50px;
top: 75px;
left: 75px;
background: green;
}
</style>
<p>You should see a dark blue rectangle with a green box.</p>
<div class="square"></div>
<div class="filt">
<div class="greenbox"></div>
</div>
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