The best sync engine you don't manage runs in one Chromium-only browser (steveharrison.dev)
His demos, built with Claude, include a markdown notes app and a node-based video compositor, all editing real local files in-page. The trick is window.showDirectoryPicker(), which lets the user's own cloud-synced folder become the sync layer. The catch the post skips: all three editors of the draft spec are Google engineers, and Jake Archibald showed up to debunk the demo's scariest fear.
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