test_postmessage_uma.html | Explore in Territory

<html>
<body>
</body>
<script>
  const url = window.location.search.substr(1);
  console.log("Loaded:" + url);
  const plugin = document.createElement("embed");
  plugin.type = "text/csv";
  plugin.src = url;
  document.body.appendChild(plugin);

  function sendMessages() {
    const messages = ["a", {type: "print"}, {type: "selectAll"}, {type: "getSelectedText"},
                      {type: "print"} /* repeated deliberately */];
    for (msg of messages)
      plugin.postMessage(msg);
  }
</script>
</html>

chromium/chrome/test/data/extensions/api_test/mime_handler_view/test_postmessage_uma.html