Browser AI as platform control

Safari’s iOS 27.3 moves (vertical tabs, Adaptive Dark Mode and Siri that can read across pages) show browsers are becoming a channel for OS‑level AI capabilities that act on and transform web content. That shift centralizes new forms of control (rendering, summarization, cross‑page querying) in the platform vendor rather than site developers or users. — If browsers become the main host for OS‑level AI features, debates about web standards, developer rights, user privacy, and platform gatekeeping will intensify.