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chromium/third_party/blink/web_tests/external/wpt/browsing-topics/document-api.tentative.https.html 

<!doctype html>
<body>
  <script src=/resources/testharness.js></script>
  <script src=/resources/testharnessreport.js></script>
  <script>
    promise_test(async t => {
      let topics = await document.browsingTopics();

      // An empty result indicates that the request was eligible for topics.
      // Currently, the web-platform-tests framework does not support actually
      // handling the topics request.
      assert_equals(topics.length, 0);
    }, 'test document.browsingTopics()');
  </script>
</body>