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

<!doctype html>
<title>CSS Fonts IDL tests</title>
<link rel="help" href="https://drafts.csswg.org/css-fonts-4/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/WebIDLParser.js"></script>
<script src="/resources/idlharness.js"></script>

<style>
  div { display: block; }
</style>
<style>
  @font-face {
    font-family: fwf;
    src: url(support/fonts/FontWithFancyFeatures.otf);
  }
</style>

<script>
  "use strict";

  idl_test(
    ["css-fonts"],
    ["cssom"],
    idl_array => {
      idl_array.add_objects({
        CSSRule: ['cssRule'],
        CSSFontFaceRule: ['cssFontFaceRule'],
      });
      self.cssRule = document.styleSheets[0].cssRules[0];
      self.cssFontFaceRule = document.styleSheets[1].cssRules[0];
    }
  );
</script>