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I believe that's a Chrome feature, not a specific website feature. If you have a manifest and it's https, Chrome will ask if you want to add to home screen. Alt

I believe that's a Chrome feature, not a specific website feature. If you have a manifest and it's https, Chrome will ask if you want to add to home screen. Although, I think they only ask once.

Andrex 9y ago
Yes. And only after repeat visits to the same site.