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chromium/third_party/blink/web_tests/external/wpt/reporting/nestedReport.html 

<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Reporting: Nested report</title>
<link rel="author" title="Paul Meyer" href="[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script>
  // Test that reports can be generated within a ReportingObserver
  // callback. These reports should be received by the same observer.
  async_test(function(test) {
    var step = 0;
    var observer = new ReportingObserver(async function(reports, observer) {
      test.step(function() {
        assert_equals(reports.length, 1);
        assert_equals(reports[0].body.message, "" + step);
      });

      ++step;
      if (step == 3)
        test.done();

      test_driver.generate_test_report("" + step);
    });
    observer.observe();

    test_driver.generate_test_report("0");
  }, "Nested report");
</script>