edit.html.twig

{% extends 'layout.html.twig' %}

{% block body %}

  <iframe src="{{ url }}"
          id="legacyContent"
          class="w-100 h-100 top-0 start-0 position-absolute border-0"
          webkitallowfullscreen
          mozallowfullscreen
          allowfullscreen>
  </iframe>

{% endblock %}