Re: [w3c/manifest] # Proposal: Add `start_failure_callback` and `fetch_failure_callback` to the Web App Manifest (Issue #1191)

christianliebel left a comment (w3c/manifest#1191)

I’m not sure if we actually need to address this, since the situation is only “unrecoverable” while the user is offline. If it’s the user’s intent to clear site data, this should include everything, including potential fallback handlers. Offline fallback screens are implemented on both the Chromium and the WebKit side at least on desktops (see below), so I don’t quite see the benefit of providing a custom UI.

<img width="757" height="640" alt="Image" src="https://github.com/user-attachments/assets/9d0751fa-eb89-4e0d-a843-41b45067c85c" />
<img width="859" height="716" alt="Image" src="https://github.com/user-attachments/assets/855e839f-c027-4541-8b46-6ff55f7818ce" />

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