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Sounds like you’re describing the Progressive Web App (PWA) install that Chrome recently added. Coming to Firefox (if not there already), and Edge. Not holding my breath for Safari though.

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Mobile Safari supports PWAs and quite a bit of infra like service workers. Last time I looked it didn't work well in the background (reloads page on resume) but seems like they have most of the building blocks.

EDIT: This post [1] says background switching should be working in iOS 13.

[1] https://medium.com/@firt/iphone-11-ipados-and-ios-13-for-pwa...

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