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

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>CSS Conditional Rules IDL tests</title>
  <link rel="help" href="https://drafts.csswg.org/css-conditional/">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <script src="/resources/WebIDLParser.js"></script>
  <script src="/resources/idlharness.js"></script>
  <!-- used to provide objects -->
  <style>
    div { display: block; }
  </style>
  <style>
    @media print { }
  </style>
  <style>
    @supports (display: block) { }
  </style>
</head>

<body>
  <div id="log"></div>

  <script>
    'use strict';
    idl_test(
      ['css-conditional'],
      ['cssom', 'dom'],
      idl_array => {
        idl_array.add_objects({
          CSSRule: ['cssRule'],
          CSSMediaRule: ['cssMediaRule'],
          CSSSupportsRule: ['cssSupportsRule'],
        });
        self.cssRule = document.styleSheets[0].cssRules[0];
        self.cssMediaRule = document.styleSheets[1].cssRules[0];
        self.cssSupportsRule = document.styleSheets[2].cssRules[0];
      }
    );
  </script>

</body>

</html>