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<!doctype html>
<meta charset=utf-8>
<title>postMessage: Third-Party to First-Party, Cross-Partition, Cross-Origin</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
// Here's the set-up for this test:
// Step 1. (Site 1 Window) set up listener and open Site 2 Frame.
// Step 2. (Site 2 Frame) set up listener and open Site 3 Window.
// Step 3. (Site 3 Window) send "Site 3 Window" message to Site 2 Frame.
// Step 4. (Site 2 Frame) receive "Site 3 Window" message and send "Site 2 Frame" message to Site 1 Window.
// Step 5. (Site 1 Window) receive "Site 2 Frame" message and exit.

async_test(t => {
  // Step 5
  const listener = t.step_func(e => {
    if (e.data === "Site 2 Frame") {
      t.done();
    }
  });
  // Step 1
  window.addEventListener("message", listener);
  const site2Frame = document.createElement("iframe");
  site2Frame.src = "http://{{hosts[alt][]}}:{{ports[http][0]}}/html/browsers/windows/post-message/resources/third-party-to-first-party-cross-partition-cross-origin-iframe.sub.html";
  document.body.appendChild(site2Frame);
}, "postMessage: Third-Party to First-Party, Cross-Partition, Cross-Origin");
</script>
</body>