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Test Info:

<!DOCTYPE html>
<title>CSS Test: mask-image: url(remote.svg#mask)</title>
<link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
<link rel="match" href="reference/mask-image-ref.html">
<meta name="assert" content="mask-image can use reference to a &lt;mask&gt; element from a remote SVG document">
<style>
#back {
position: absolute;
box-sizing: border-box;
width: 200px;
height: 200px;
border: 60px solid green;
background: red;
}
#front {
position: absolute;
box-sizing: border-box;
width: 200px;
height: 200px;
border: 40px solid red;
background: green;
mask-image: url(support/mask.svg#mask);
}
</style>
<p>The test passes if there is a green square and no red below.</p>
<div id="back"></div><div id="front"></div>