I tested Chrome and Firefox on Android and got some results:

Chrome fires a keyup/down event with the Unidentified key value other that the Enter key (https://issues.chromium.org/issues/41443178) and only the (before)input events are valid for text input.

demo video

chrome1.mp4

Firefox fires two events like the desktop version: the correct keyup/down event and the (before)input events. When deleting text, Firefox fires a keyup/down event with the Process key value and deleteContextBackwards as inputType, and fires a keyup/down event with the Backspace key value when the text input area is empty.
The Process key is a placeholder for IME events: https://stackoverflow.com/questions/71961563/keyboard-event-has-key-process-on-chromebook

demo video (2)

ffox1.mp4

Tested on:

OS: Android 12
Keyboard: GBoard 14.8
Firefox 132 (Release)
Chrome 131 (Release)

I have two possible solutions:

make an own virtual keyboard like a https://furcan.github.io/KioskBoard/, but this solution will have a significant amount of code implemented
leave the native keyboard and register the input event and simulate key presses. Since Firefox fires a keyup/down and input events at the same time, need to left only input event for Firefox Mobile or for all mobile browsers

Other notes:

in 2021, the VirtualKeyboard API was released, which has an interesting things: virtualKeyboard.show() method and the geometrychange event, but has limitations: only HTTPS pages and only Chrome are supported (for 2024-25)

Links for testing:

W3C Keyboard Event Viewer: https://w3c.github.io/uievents/tools/key-event-viewer.html
FreeDOS profile: https://copy.sh/v86/?profile=freedos

If someone has an iOS/iPadOS device, I'd be interested to hear the results on those OSes, thanks in advance!

android keyboard not working #262

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