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chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/history-traversal/pageswap/pageswap-initial-navigation.html 

<!DOCTYPE HTML>
<title>Tests pageswap dispatch on initial doc navigation</title>
<link rel="author" title="Khushal Sagar"  href="mailto:[email protected]">
<link rel="help" href="https://html.spec.whatwg.org/">
<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>
setup({explicit_done: true});

function runTest(frame) {
  let frameWindow = frame.contentWindow;

  let pageswapfired = false;
  frameWindow.onpageswap = (e) => {
      pageswapfired = true;
  }

  frameWindow.onpagehide = (e) => {
      assert_true(pageswapfired, 'pageswap fired');
      done();
  }

  frame.srcdoc = '<html></html>';
}

promise_test(async t => {
  onload = () => {
    let frame = document.createElement('iframe');
    document.body.appendChild(frame);
    runTest(frame);
  };
});
</script>