third_party_window.html

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<!--

  Any copyright is dedicated to the Public Domain.

  http://creativecommons.org/publicdomain/zero/1.0/

-->

<html>

<head>

  <title>Indexed Database Test</title>

  <script type="text/javascript">

    let init = false;

    onmessage = evt => {

      if (!init) {

        init = true;

        let iframe = document.getElementById("iframe1");

        iframe.src = evt.data.iframeUrl;

        iframe.addEventListener("load", () => {

          iframe.contentWindow.postMessage(JSON.stringify(evt.data), "*");

});

        return;

      opener.postMessage(evt.data, "*");

};

  </script>

</head>

<body>

  <iframe id="iframe1"></iframe>

</body>

</html>