redoc/lib/shared/components/Zippy/zippy.html

<div class="zippy zippy-{{type}}" [ngClass]="{'zippy-empty': empty}">
  <div class="zippy-title" (click)="toggle()">
    <span class="zippy-indicator">{{ visible ? '&#9662;' : '&#9656;' }}</span>
    {{title}}
  </div>
  <div class="zippy-content" @openClose="visible ? 'expanded' : 'collapsed'">
    <div class="zippy-content-wrap">
      <ng-content></ng-content>
    </div>
  </div>
</div>