Text selection is reset after pressing a button in iOS/iPadOS

Problem
The Selection and Range article includes a demo button that should show an alert with the selected text. On desktop environments or non-Apple mobile devices, the demo works correctly. The alert shows the current selected text, while the selection itself is also maintained.

However on iOS/iPadOS devices(iPhone, iPad, ...) the text selection disappears as soon as you press the button and the alert appears with empty text.

I believe this is an issue with iOS/iPadOS Safari, rather than a bug in javascript.info but nevertheless I wonder if anyone could share some insight on why this isn't working as expected. I've tried my best but up to this point could not find any similar troubleshooting anywhere else.

https://user-images.githubusercontent.com/34783801/176479597-5d7d5621-a513-497a-a114-3cd4b2c055f8.MP4

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Inizia con l’articolo su Selection and Range e il relativo pulsante demo, quindi riproduci il comportamento in iOS/iPadOS Safari usando l’esempio fornito. Confronta il testo selezionato e il comportamento di alert con gli ambienti desktop e mobili non Apple; il lavoro è completato quando viene stabilito se si tratta di una limitazione di Safari o di un problema nella demo e vengono documentate le prove o un workaround supportato.