3rdPartyPartitioned.html

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<html>

<head>

  <title>3rd party content!</title>

</head>

<body>

<h1>Here the 3rd party content!</h1>

<script>

onmessage = async function(e) {

  let cb = e.data.cb;

  let runnableStr = `(() => {return (${cb});})();`;

  let runnable = eval(runnableStr); // eslint-disable-line no-eval

  let variant = (new URL(location.href)).searchParams.get("variant");

  let win = this;

  if (variant == "initial-aboutblank") {

    let i = win.document.createElement("iframe");

    i.src = "about:blank";

    win.document.body.appendChild(i);

    // override win to make it point to the initial about:blank window

    win = i.contentWindow;

  let result = await runnable.call(this, win, e.data.value);

  parent.postMessage(result, "*");

};

</script>

</body>

</html>