Z-index
A five-step ladder. If two things fight, one of them is on the wrong step.
| Step | Owns |
|---|---|
--z-below · .u-z-below | behind the canvas (pattern layers) |
--z-raised · .u-z-raised | card cover links, badges over media |
--z-nav · .u-z-nav | the nav island, this sidebar |
--z-overlay · .u-z-overlay | modals, offcanvas, toasts |
--z-top · .u-z-top | skip link, debug chrome |