@JibberJim @neil_neilzone @AlecMuffett @w3c They almost certainly do. User-agent client hints include whether the device is a mobile device or not, as well as the underlying platform (linux, windows, android etc) - #navigatoruadata' target=_blank rel='nofollow noopener'>https://wicg.github.io/ua-client-hints/#navigatoruadata If anything it's *easier* to tell nowadays, as you don't have to parse arbitrary UAs