How to catch a keystroke from a Bluetooth headset using JS in a browser?

Question

JavaScript

Hello. On sites with radio and music (not all), the player can turn on (play / pause) after pressing the on / off button. on a Bluetooth headset. But listeners onclick, onkeydown, etc. do not catch such an event. For example, this works on Yandex.Music or on this site. The volume buttons, when pressed for a long time, begin to add / decrease the sound (but on Windows). How does such a mechanism work on these sites, how to make it possible to process button presses of the Bluetooth headset on your site?
Purpose: Press the button on the headset to run the script/action in the browser on the computer.

Answer 1

https://web.dev/media-session/
You hang up the play/pause event handler. And these events are also called when you click on system controls in the OS and when you press keys on headsets, and so on.