Where the browser supports it (Chrome 111+, Safari 18+, Firefox 139+),
switchWithTransition now uses the native View Transitions API: the old
shelves are snapshotted, the fetch + swap happen behind the dim, and the
two snapshots crossfade — no blank phase, no manual opacity
choreography. The dim + spinner is hidden inside the update so it blends
away as part of the transition. Browsers without the API keep the
existing dim + fade sequence unchanged. Zero dependencies — the
crossfade is the browser's own.
John O'Keefe
a31da89df5