It's there if needed. A WebUSB implementation via native messaging.

• PDFs only
• provide photos!
• booking online
• integrations (birthday, events, ...)

SEO is important for search engines and other services (TripAdvisor, Google Maps, Instagram). The majority of the users are using smartphones, so mobile-first is definitely a way to built these websites.

About the possibilities of the web

The GNU Coreutils version published a faster version of some tools