iframe_sandbox_block.html

Enable keyboard shortcuts

<!doctype html>

<html>

  <head>

    <meta charset="utf-8" />

    <meta name="viewport" content="width=device-width, initial-scale=1.0" />

  </head>

  <body>

    <iframe

      id="iframe"

      src="iframe_sandbox_content.html"

      sandbox="allow-same-origin"

    ></iframe>

  </body>

</html>