Implementation:SeleniumHQ Selenium Closure Dom Classlist

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 CSS class manipulation utilities used by Selenium JavaScript atoms.

Description

goog.dom.classlist is a vendored copy of the Google Closure Library module. It provides utilities for detecting, adding, and removing CSS classes on DOM elements. It attempts to use the native classList (DOMTokenList) API when available for better performance, with a fallback to className string manipulation. It handles SVGElements correctly via getAttribute. Selenium uses this as part of its JavaScript atom infrastructure for browser automation commands.

Usage

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

Code Reference

Source Location

• Repository: SeleniumHQ_Selenium
• File: third_party/closure/goog/dom/classlist.js
• Lines: 1-315

Key Exports

goog.provide('goog.dom.classlist');

// Key exported functions:
goog.dom.classlist.get(element)
goog.dom.classlist.set(element, className)
goog.dom.classlist.contains(element, className)
goog.dom.classlist.add(element, className)
goog.dom.classlist.addAll(element, classesToAdd)
goog.dom.classlist.remove(element, className)
goog.dom.classlist.removeAll(element, classesToRemove)
goog.dom.classlist.enable(element, className, enabled)
goog.dom.classlist.enableAll(element, classesToEnable, enabled)
goog.dom.classlist.swap(element, fromClass, toClass)
goog.dom.classlist.toggle(element, className)
goog.dom.classlist.addRemove(element, classToRemove, classToAdd)

Related Pages

• Environment:SeleniumHQ_Selenium_Contributor_Development_Environment