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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/SerialPort/getInfo below:

SerialPort: getInfo() method - Web APIs

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The getInfo() method of the SerialPort interface returns an object containing identifying information for the device available via the port.

None.

An object containing the following properties:

usbVendorId

If the port is part of a USB device, this property is an unsigned short integer that identifies the device's vendor. If not, it is undefined.

usbProductId

If the port is part of a USB device, this property is an unsigned short integer that identifies the USB device. If not, it is undefined.

bluetoothServiceClassId Experimental

If the port is a Bluetooth RFCOMM service, this property is an unsigned long integer or string representing the device's Bluetooth service class ID. If not, it is undefined.

This snippet calls the Serial.requestPort() method when a <button> is pressed. We pass a filter to requestPort() to filter for Arduino Uno USB devices. Once a port is requested, we call getInfo() to return the device's usbProductId and usbVendorId.

<button id="connect">Connect</button>

const connectBtn = document.getElementById("connect");

// Filter for devices with the Arduino Uno USB Vendor/Product IDs
const filters = [
  { usbVendorId: 0x2341, usbProductId: 0x0043 },
  { usbVendorId: 0x2341, usbProductId: 0x0001 }
];

connectBtn.addEventListener("click", () => {
  try {
    // Prompt the user to select an Arduino Uno device
    const port = await navigator.serial.requestPort({ filters });

    // Return the device's identifying info
    const { usbProductId, usbVendorId } = port.getInfo();
  } catch (e) {
    // The user didn't select a device
  }
});

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