inspector-template.html

Enable keyboard shortcuts

<html>

<body>

  <template>

    <p>template content</p>

  </template>

  <div></div>

  <script>

    "use strict";

    const template = document.querySelector("template");

    const clone = document.importNode(template.content, true);

    document.querySelector("div").appendChild(clone);

    window.opener.postMessage("ready", "*");

  </script>

</body>

</html>