File: print-during-beforeunload.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>print() during beforeunload</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<body>
<script>
"use strict";

async_test(t => {
  const w = window.open("resources/print-during-event.sub.html?event=beforeunload");
  t.add_cleanup(() => w.close());

  const messages = [];
  window.addEventListener("message", t.step_func(({ data }) => {
    messages.push(data);

    if (messages.length === 1) {
      assert_array_equals(messages, ["start"]);
      w.location.href = "resources/destination.html";
    } else if (messages.length === 2) {
      // The test passes if we've reached this point because the print() dialog did not block the navigation.
      assert_array_equals(messages, ["start", "destination"]);
      t.done();
    }
  }));
});
</script>