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chromium/third_party/blink/web_tests/external/wpt/css/css-masking/mask-image/mask-image-url-local-mask.html 

<!DOCTYPE html>
<title>CSS Test: mask-image: url(#local-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="help" href="https://drafts.fxtf.org/css-masking-1/#mask-layer-image">
<link rel="match" href="reference/mask-image-ref.html">
<meta name="assert" content="mask-image can use local reference to a &lt;mask&gt; element">
<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(#localmask);
}
</style>
<p>The test passes if there is a green square and no red below.</p>
<div id="back"></div><div id="front"></div>
<svg viewBox="0 0 200 200" style="width: 0; height: 0">
  <mask id="localmask">
    <rect x="50" y="50" width="100" height="100" fill="white">
  </mask>
</svg>