OgygiaRouter
persist probe

mount id: 1wmbx

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Survives SPA nav — this node is under data-ogygia-persist.

SPA router

<OgygiaRouter /> is rendered in this site's root layout, so navigation between these pages is a client-side swap: the body is replaced, the head is merged, and a View Transition plays where supported. The heading morphs across pages because it carries a shared view-transition-name. Same-route hash changes skip the transition; going to another route with a hash (for example /playground/router/a#top) still transitions, then scrolls.

The persist probe above the page content sits in data-ogygia-persist="router-demo-chrome" in this section's layout. Click +1, then go to Page A and back — mount id and click count stay put. The route probe below remounts on every navigation (fresh mount id); that is the default for islands outside persist chrome.

route probe

path: /playground/router

mount id: p8t6t

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This site sets data-sveltekit-preload-data="off" on <body> (the sidenav opts hover back in). The links below opt specific triggers back in for the demo. The router warms its page-HTML cache on the declared trigger; a prefetched page swaps in on click with no second request.