Agustin Barrientos leans on showModal() to get focus trapping, Escape to close, and focus restoration for free, then wraps it in a reusable Lit component with typed events. He sets deliberate initial focus, adds light-dismiss with the closedby attribute, animates with the :open pseudo-class and @starting-style, and respects prefers-reduced-motion.
agustinbarrientos.com/writing/senior-eye/accessible-modal-dialog