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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Comienza con el artículo sobre Selection and Range y su botón de demostración; después, reproduce el comportamiento en iOS/iPadOS Safari usando el ejemplo proporcionado. Compara el texto seleccionado y el comportamiento de alert con entornos de escritorio y móviles que no sean de Apple; se considera terminado cuando se haya establecido si se trata de una limitación de Safari o de un problema en la demo, y se hayan registrado las pruebas o un workaround compatible.