<!doctype html>
<title>First title</title>
<iframe srcdoc=""></iframe>
<script>
onload = function() {
  // This iframe doc shouldn't override our title.
  let doc = document.querySelector("iframe").contentDocument;
  doc.open();
  doc.write("<title>This is not your title</title>Hello");
  doc.close();

  if (doc.title == "This is not your title") {
    // Now navigate away so that the test has something to wait for to ensure the
    // relevant code has run.
    let link = document.createElement("a");
    link.href = window.location.href.replace("-1.html", "-2.html");
    link.click();
  }
}
</script>
