<details>  
  <summary class="video-summary">
    <!-- Video Placeholder Image -->
    <img src="https://lab.n8d.studio/htwoo/htwoo-core/images/videos/big-bug-bunny.webp" class="video-thumbnail">
    <!-- Play Button -->
    <svg class="video-playicon" data-id="icon-play-filled" viewBox="0 0 32 32" data-icontype="filled"><path d="m11.167 5.608 16.278 8.47a2.169 2.169 0 0 1 .011 3.838l-.012.006-16.278 8.47a2.167 2.167 0 0 1-3.167-1.922V7.529a2.167 2.167 0 0 1 3.047-1.981l-.014-.005.134.065z"></path></svg>
  </summary>

  <!-- we'll get here... -->
</details>

When a visitor decides to watch the video and clicks on the thumbnail, the open attribute will be placed by the browser on the details attribute, which means the video summary can be hidden.