+<li><a href="#sec-2">2. Cases, covers, holders, organizers</a>
+<ul class="nav">
+<li><a href="#sec-2-1">2.1. Measurement</a></li>
+<li><a href="#sec-2-2">2.2. Optics</a></li>
+<li><a href="#sec-2-3">2.3. Miscellaneous</a></li>
+<li><a href="#sec-2-4">2.4. Cable / wire</a></li>
+</ul>
+</li>
+<li><a href="#sec-3">3. Miscellaneous</a>