create-connection-to-arduino.js

// (a) Import the module
import Controller from 'webusb-dmx512-controller/controller.js'

// (b) Create an instance
const controller = new Controller()

// (c) Get a reference to the button
const activateButton = document.getElementById('activateWebUsb')

// (d) Listen for click events on the button
activateButton.addEventListener('click', e => {

  // (e) Enable WebUSB and select the Arduino
  controller.enable().then(() => {

    // (f) Create a connection to the selected Arduino
    controller.connect()
  })

})