File: cross_origin_srcdoc_sandboxed_postmessage.html

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<html>
    <head>
        <title>Test: sandboxed-srcdoc iframe with postMessage from parent</title>
    </head>
    <body>
    <script>
        const child_response_promise =
          new Promise(resolve => {
                window.addEventListener("message", (event) => {
                  console.log('parent received: ' + event.data);
                  resolve();
                });
          });

        const prerender_handler_promise =
          new Promise(resolve => {
               document.onprerenderingchange = () => {
                 console.log('parent onprerenderingchanged');
                 resolve();
               };
          });

        function createSrcdoc() {
          const frm = document.createElement('iframe');
          frm.sandbox = 'allow-scripts';
          frm.onload = () => {
              frames[0].postMessage("hello","*");
          };
          frm.srcdoc =
              '<html><body><script>' +
              '    window.addEventListener("message", (event) => { ' +
              '        const target = event.source; ' +
              '        console.log("srcdoc received: " + event.data); ' +
              '        target.postMessage(event.data + " from srcdoc", "*");' +
              '    }); ' +
              'console.log("srcdoc loaded!");' +
              '</scr' + 'ipt></body></html>';
            document.body.append(frm);
        }
        </script>
    </body>
</html>