angular-docs-cn/aio/tools/transforms/templates/includes/_selectors.html

{%- if doc.directiveOptions.selector.split(',').length %}
<div class="selectors api-section">
  <h2>Selectors</h2>
  {% for selector in doc.directiveOptions.selector.split(',') %}
  <p class="selector">
    <code>{$ selector $}</code>
  </p>
  {% endfor %}
</div>
{% endif %}