ant-design/site/templates/code.html

<div class="code-box" id="{{post.meta.id|removeCodeBoxIdPrefix}}">
  <div class="code-box-demo">
    <div id="{{post.meta.id}}"></div>
    <script>mountNode = document.getElementById('{{post.meta.id}}');</script>
    {{ post.html }}
  </div>
  <div class="code-box-meta markdown">
    <div class="code-box-title">
      <a href="#{{post.meta.id|removeCodeBoxIdPrefix}}">{{ post.title }}</a>
    </div>
    {{ post.meta.description }}
    <span class="collapse anticon anticon-circle-o-right" unselectable="none"></span>
  </div>
</div>