api.Window.gamepadconnected_event - Joystick events are not registering Bluetooth controllers on iOS/android mobile phones

What type of issue is this?

Browser bug (a bug with a feature that may impact site compatibility)

What information was incorrect, unhelpful, or incomplete?

1. Connect any controller to bluetooth on iPhone (I used an Xbox controller)
2. Use left/right joysticks to try and register the controller (I used luna.amazon.com)

Expected:

• gamepadconnected_event is fired and gamepad is registered
  Actual:
• Controller does not get registered until a button other than the joysticks is used (such as dpad, A, X, Y)

What browsers does this problem apply to, if applicable?

Chromium (Chrome, Edge 79+, Opera, Samsung Internet), Safari

What did you expect to see?

I expect to see the controller registered to the browser

Did you test this? If so, how?

1. Connect any controller to bluetooth on iPhone (I used an Xbox controller)
2. Use left/right joysticks to try and register the controller (I used luna.amazon.com)

Expected:

• gamepadconnected_event is fired and gamepad is registered
  Actual:
• Controller does not get registered until a button other than the joysticks is used (such as dpad, A, X, Y)

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

No response

Do you have anything more you want to share?

No response

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/Window/gamepadconnected_event

MDN metadata

MDN page report details

• Query: api.Window.gamepadconnected_event
• Report started: 2023-05-09T20:02:04.546Z

Start with the current compatibility data entry for Window.gamepadconnected_event, using the linked MDN URL as the entry point. Reproduce the Bluetooth joystick behavior on the listed mobile browsers and compare it with the existing data. Done means the compatibility data accurately reflects whether joystick input registers the controller and fires gamepadconnected_event.