Support

Supported release boundary

The v1 reader targets current Chromium, Firefox, and WebKit browser engines and a defined physical-device matrix. Automated browser-engine and responsive-device-profile results are not substitutes for physical-device certification. A broad v1.0 physical support claim is made only after the exact release SHA has passing records for every required physical target.

Supported personal imports are non-DRM EPUB and PDF files within the documented size and safety limits. Scripted EPUB content remains disabled. Encrypted/DRM publications, hostile archives, active-content PDFs, obsolete browsers, and environments that disable required browser storage, Blob, Canvas, Worker, or Web Crypto capabilities are outside the supported boundary.

Recovery

If browser-local state is lost, restore a previously exported JSON backup or, when THIEPN Account sync was explicitly enabled, reconnect the same account and adopt its latest cloud snapshot. Personal EPUB/PDF file bytes are included in neither path; re-import the original matching files to reconnect restored personal-book metadata. EPUB CFIs and PDF page positions remain format-specific and are never heuristically translated between formats or publication releases.

Offline and storage

Hosted publications explicitly downloaded for offline use can reopen without a network connection after the offline shell has been installed. Personal books remain in IndexedDB. Browser storage can still be evicted or cleared by the browser, operating system, or user, so a local browser profile should not be treated as the only backup of important reading state or personal files.

Release status

The application can be production-verified before the final v1.0 support claim. The final v1.0 tag is fail-closed on the exact production source, security/dependency gates, protected-main configuration, and complete exact-SHA physical-device evidence.