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chromium/third_party/blink/web_tests/external/wpt/css/css-shadow-parts/idlharness.html 

<!DOCTYPE html>
<title>CSS Shadow Parts IDL tests</title>
<link rel="help" href="https://drafts.csswg.org/css-shadow-parts/#idl">
<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>
idl_test(
  ['css-shadow-parts'],
  ['dom'],
  idl_array => {
    self.element = document.createElementNS('ns', 'e');
    self.htmlElement = document.createElement('html');
    self.svgElement = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
    idl_array.add_objects({
      Element: ['element', 'htmlElement', 'svgElement'],
    });
  }
);
</script>