How detect does site have an app in appstore in browser? - mobile

Sometimes iOS offer install app if site have it in appstore.
How does it work?
For example: http://habrastorage.org/files/e3f/4b2/f3b/e3f4b2f3bd6b41609ff52652acca547d.PNG

Thats just either an safari, figuring out that that website has an app or the website detecting your on ios and requesting a app store link or notifying safari that there is an app

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What might be the issue? Why doesn't it work on IOS Facebook in-app browser?

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here if anyone wants to inspect it.
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Still possible to upload ReactJS app to App store?

Im currently developing a ReactJS (PWA) application that is intended for both web and mobile.
For iOS, I planned to build a simple app in Xcode with a WKWebView browser pointing to the web version of the app, and then upload it to App store for distribution. Im planning on doing same thing for Google Play.
But after reading up a bit on articles/posts from 2019 on this subject, PWAs uploaded to App store seems to be rejected by Apple as they are not a native mobile app...
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Click the ios7 web app map link, it opens the Google maps instead of default map app

I have a mobile website/app that I created, and the map links opened the local map app before the IOS 7 upgrade. Now when I save the mobile site to the home screen, and click on the map link it opens up in Google Maps instead of the local Apple map app.
This is the code I am currently using:
<a href="http://maps.apple.com/?q=cupertino">
Please help, thanks!
Is it opening in the Google Maps app or website? If it's opening in the google maps app, it could be an issue with your default maps app (I honestly don't know)
Otherwise, that should work.
I would also maybe verify that you are not looking at a cached copy.
..also, is this Safari (default) or Chrome?

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