<navigation>
* [Home :house:]({{ baseUrl }}/index.html)
* [Topic 1]({{baseUrl}}/contents/topic1.html)
* [Topic 2]({{baseUrl}}/contents/topic2.html)
* Topic 3 :expanded:
  * [Topic 3a]({{baseUrl}}/contents/topic3a.html)
  * [Topic 3b]({{baseUrl}}/contents/topic3b.html)
</navigation>