subframe_message_navigate.html

Enable keyboard shortcuts

<!DOCTYPE html>

<html>

  <head>

    <meta charset="utf-8" />

    <title>Subframe that navigates itself on request</title>

    <script>

      window.addEventListener("message", event => {

        window.location.href = event.data;

});

    </script>

  </head>

  <body>

    subframe

  </body>

</html>