Hierarchical Scrollable Nav
App shell with a collapsible nav tree. Uses existing primitives only — no treeview component.
<aside>
<nav class="nav-list scroller" data-enhance="scrollspy" aria-label="Docs">
<details open>
<summary>Getting started</summary>
<a class="nav-link" href="#intro">Introduction</a>
<a class="nav-link" href="#install">Installation</a>
</details>
<details>
<summary>Components</summary>
<a class="nav-link" href="#alert">Alert</a>
<a class="nav-link" href="#badge">Badge</a>
</details>
</nav>
</aside>.nav-list+.nav-link: Actual's nav chrome- Native
<details>: exclusive accordion with<details name>(no JS engine) data-enhance="scrollspy": scroll-drivenaria-current.scroller: thin, theme-aware scrollbar- No
.nav-heading/.nav-sublistclasses — the existing primitives are enough