Media Session. Play & pause action handlers

index.js

// to set action handlers
window.navigator.mediasSession.setActionHandler('play', () => { /* your play */ });
window.navigator.mediasSession.setActionHandler('pause', () => { /* your pause */ });

// to reset action handlers
window.navigator.mediasSession.setActionHandler('play', null);
window.navigator.mediasSession.setActionHandler('pause', null);

// handlers like action & pause have defaults, to cancel them you can use noop function
window.navigator.mediasSession.setActionHandler('play', () => {});
window.navigator.mediasSession.setActionHandler('pause', () => {});