iOS (web): keyboard doesn't start capitalised (uppercase)

[ellatrix]

Description

Whenever you create a new paragraph, the keyboard is in a lowercase mode. This in unexpected compared to other inputs where the first letter is normally uppercase.

Step-by-step reproduction instructions

RPReplay_Final1720457076.mp4

Screenshots, screen recording, code snippet

No response

Environment info

iOS Safari

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes

[sarthaknagoshe2002]

@ellatrix I was able to reproduce this issue on android devices as well as mac OS when using browser.
Seems like this is not just an IOS issue

[dcalhoun]

It appears the zero width non-breaking space character (ZWNBSP) is the problem. Simply removing the appending of ZWNBSP does resolve the broken auto-capitalization bug, but given the complexity noted in #14846, I imagine removing it is not a valid approach.

I'm experimenting with leveraging the web editor in the WordPress mobile apps. Unfortunately, the broken auto-capitalization is quite disruptive for the writing flow on mobile devices.

@ellatrix do you have initial thoughts as to how we might address this issue?