drupal-vue/docroot/themes/custom/vue_js/src/components/collapsible/collapsible.twig

{{ attach_library('vue_js/collapsible') }}
{{ attach_library('vue_js/collapsible-non-vue') }}
<div class="collapsible collapsible-non-vue closed">
  <div class="title">
    <h2>{{ title }}</h2>
  </div>
  <div class="body">
    {{ body }}
  </div>
</div>