replace-or-assign-call-on-iframe.html

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<!DOCTYPE HTML>

<html>

  <head>

    <title>Referer with location.replace and location.assign</title>

  </head>

  <body>

    <iframe src="/resources/blank.html" hidden></iframe>

    <script>

      window.addEventListener('message', function (e) {

        const referrer = e.data;

        window.parent.postMessage(referrer);

});

      if (window.location.search === "?replace") {

        document.querySelector("iframe").contentWindow.location.replace("iframe-contents.sub.html?replace");

      } else if (window.location.search === "?assign") {

        document.querySelector("iframe").contentWindow.location.assign("iframe-contents.sub.html?assign");

    </script>

  </body>

</html>