iOS Web App: Use back swipe gesture to go back

I adapted my website according to the official guide over at

https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariWebContent/ConfiguringWebApplications/ConfiguringWebApplications.html

Since I made the changes my website looks like an app when I add it as a bookmark to the homescreen. However, my web app relies on the go-back button/gesture even if there is no page refresh. But the gesture does not work out of the box. What can I do to acticate it? I read that iOS 12.2 should support the gesture.