Implementation:SeleniumHQ Selenium Closure UserAgent Browser

Knowledge Sources	SeleniumHQ_Selenium Google Closure Library
Domains	JavaScript_Atoms, Vendored_Library
Last Updated	2026-02-12 00:00 GMT

Overview

Vendored Google Closure Library module providing browser user agent detection used by Selenium JavaScript atoms.

Description

goog.labs.userAgent.browser is a vendored copy of the Google Closure Library module. It provides browser detection capabilities using user agent string analysis and the newer User-Agent Client Hints API. The module defines a Brand enum covering major browsers (Chromium, Edge, Firefox, IE, Opera, Safari, Android Browser, Silk) and supports high-entropy version detection. Selenium uses this as part of its JavaScript atom infrastructure.

Usage

This module is consumed internally by Selenium's JavaScript atoms build system. Not imported directly by end users.

Code Reference

Source Location

Repository: SeleniumHQ_Selenium
File: third_party/closure/goog/labs/useragent/browser.js
Lines: 1-790

Key Exports

goog.module('goog.labs.userAgent.browser');

const Brand = {
  ANDROID_BROWSER: 'Android Browser',
  CHROMIUM: 'Chromium',
  EDGE: 'Microsoft Edge',
  FIREFOX: 'Firefox',
  IE: 'Internet Explorer',
  OPERA: 'Opera',
  SAFARI: 'Safari',
  SILK: 'Silk',
};

Related Pages

Environment:SeleniumHQ_Selenium_Contributor_Development_Environment

Page Connections

Double-click a node to navigate. Hold to expand connections.

Principle

Implementation

Heuristic

Environment