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chromium/third_party/blink/web_tests/external/wpt/speculation-rules/prefetch/multiple-url.https.html 

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/dispatcher/dispatcher.js"></script>
<script src="/common/utils.js"></script>
<script src="../resources/utils.js"></script>
<script src="resources/utils.sub.js"></script>

<script>
  setup(() => assertSpeculationRulesIsSupported());

  promise_test(async t => {
    let urls = getPrefetchUrlList(5);
    insertSpeculationRules({ prefetch: [{ source: 'list', urls: urls }] });
    await new Promise(resolve => t.step_timeout(resolve, 3000));

    let prefetched_count = (await Promise.all(urls.map(isUrlPrefetched))).reduce(
      (count, was_prefetched) => count + (was_prefetched ? 1 : 0), 0);

    assert_greater_than_equal(prefetched_count, 2, "At least two urls should be prefetched to pass the test.");
  }, "browser should be able to prefetch multiple urls");
</script>