New comment template (and variables) for Twig in D8

gistfile1.txt

<article{{ attributes }}>

  {{ title.prefix }}
  {% if new %}
    <mark class="new">{{ new }}</mark>
  {% endif %}
  <h3{{ title.attributes }}>{{ title.label }}</h3>
  {{ title.suffix }}

  <footer>
    {{ author }}
    <p class="submitted">
      {% trans %}
        Submitted by {{ author.name }} on {{ published_date }}
      {% endtrans %}
    </p>
    {#
      Indicate the semantic relationship between parent and child comments
      for accessibility. The list is difficult to navigate in a screen reader
      without this information.
    #}
    {% if parent %}
      <p class="parent element-invisible">{{ parent }}</p>
    {% endif %}

    {{ permalink }}
  </footer>

  <div{{ content.attributes }}>
    {{ content.remainder }}

    {% if author.signature %}
      <div class="user-signature">
        {{ author.signature }}
      </div>
    {% endif %}
  </div>

  {{ links }}
</article>