remove-append-shadow-host-1.html

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<!DOCTYPE html>

<html>

  <head>

  </head>

  <body>

    <div id="container"><div id="host"></div></div>

    <script>

      var host = document.getElementById("host");

      var root = host.attachShadow({mode: 'open'});

      root.innerHTML = 'inside shadow DOM';

      var container = document.getElementById("container");

      container.removeChild(host);

      container.appendChild(host);

    </script>

  </body>

</html>