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chromium/third_party/blink/web_tests/external/wpt/navigation-api/currententrychange-event/navigate-from-initial-about-blank-same-doc.html 

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="i"></iframe>
<script>
promise_test(async t => {
  i.contentWindow.navigation.oncurrententrychange = t.unreached_func("currententrychange should not fire");
  i.contentWindow.location.href = "about:blank#1";
  i.contentWindow.location.href = "about:blank#2";
  await new Promise(resolve => t.step_timeout(resolve, 10));
}, "currententrychange does not fire when navigating away from the initial about:blank");
</script>