File: file_top_navigation_by_user_activation_iframe.html

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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<script src="/tests/SimpleTest/EventUtils.js"></script>
<title>Test window for top navigation with user activation</title>
<script>
function navigate(aURL) {
  try {
    top.location.href = aURL;
  } catch (e) {
    top.postMessage("BLOCKED", "*");
  }
}

window.onmessage = (e) => {
  SpecialPowers.wrap(document).clearUserGestureActivation();
  let [command, url] = e.data;
  if (command == "CLICK") {
    let button = document.querySelector("button");
    button.addEventListener("click", () => {
      navigate(url);
    }, { once: true });
    synthesizeMouseAtCenter(button, {});
  } else if (command == "SCRIPT") {
    navigate(url);
  }
};
</script>
</head>
<body><button>Click</button></body>
</html>