CSS-driven accessible tooltip for mounted admin pages.
Uses a :hover + :focus-within CSS reveal pattern — no JS
required. The tooltip content is positioned via CSS at the
--ax-z-popover (300) layer.
The trigger slot wraps any keyboard-reachable element (e.g. a
button or a focusable icon). The tooltip content is linked via
role="tooltip" for screen reader announcements. Callers can
additionally wire aria-describedby on the trigger to the
tooltip content ID for explicit association.
Example:
<.tooltip content="Copy to clipboard" position="above">
<button type="button" aria-label="Copy">…</button>
</.tooltip>