HTML5 – Usage of details and summary tags

Following code shows usage of the details and summary tags that are introduced in HTML5.

<details>
  <summary>This is the summary</summary>
    <ul>
      <li>And here the details #1</li>
      <li>And here the details #2</li>
      <li>And here the details #3</li>
    </ul>
</details>