css/css-masking/idlharness.html

<!doctype html>
<title>css-masking IDL tests</title>
<link rel="help" href="https://drafts.fxtf.org/css-masking-1/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/WebIDLParser.js"></script>
<script src="/resources/idlharness.js"></script>

<script>
  'use strict';

  idl_test(
    ['css-masking'],
    ['SVG', 'html', 'dom'],
    idl_array => {
      idl_array.add_objects({
        SVGClipPathElement: [document.querySelector('#clip1')],
        SVGMaskElement: [document.querySelector('#mask1')],
      });
    }
  );
</script>

<svg xmlns="http://www.w3.org/2000/svg" xmlns:html="http://www.w3.org/1999/xhtml">
  <clipPath id="clip1">
    <rect x="50" y="50" width="100" height="100" />
  </clipPath>
  <mask id="mask1" x="0" y="0" width="1" height="1" maskContentUnits="objectBoundingBox">
    <rect x="0" y="0" width="1" height="1" fill="white" />
  </mask>
</svg>