Safari on iPad is a critical scenario for us, however, it isn’t currently “officially” supported. Yet! Stay tuned to this GitHub issue, where we’ll provide updates on this very soon: https://github.com/MicrosoftDocs/vsonline/issues/33.

Regarding requirements, you could absolutely run the web editor from a Chromebook! Being able to utilize low-powered devices, while using real-world dev tools, is something we’re excited to enable with this service.