ScrollArea — themed scrollbar wrapper around native overflow scrolling. No Fluxon equivalent.

Pure CSS: the browser keeps ownership of wheel, touch, momentum, and scrollbar auto-hide behavior; LanternUI only themes the scrollbar (scrollbar-width/scrollbar-color plus the ::-webkit-scrollbar pseudo-elements) through --lantern-* tokens. No JS hook.

<.scroll_area label="Recent activity" class="feed" style="max-height: 20rem;">
  <p :for={item <- @items}>{item}</p>
</.scroll_area>

The consumer constrains the box (max-height, height, grid track, …); without a constraint nothing overflows and no scrollbar appears.

Accessibility

Per the WAI-ARIA guidance for scrollable containers, a region whose content is reachable only by scrolling must be operable from the keyboard. When label is set the wrapper renders role="region", aria-label, and tabindex="0" so keyboard users can focus it and scroll with the arrow keys. Omit label only when the scrolled content manages focus itself (e.g. it wraps an interactive widget with its own tab stops).