Implementation:SeleniumHQ Selenium Closure UI MenuButton

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 UI module providing a menu button control that composes a button with a dropdown menu, used by Selenium JavaScript atoms.

Description

goog.ui.MenuButton is a vendored copy of the Google Closure Library module. It extends `goog.ui.Button` by composing a button with a dropdown arrow and a popup menu. It supports the OPENED state, handles menu positioning via `goog.positioning.MenuAnchoredPosition`, and manages keyboard and mouse event delegation between the button and its associated menu. Selenium uses this for 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/ui/menubutton.js
• Lines: 1-1143

Key Exports

goog.provide('goog.ui.MenuButton');

Related Pages

• Environment:SeleniumHQ_Selenium_Contributor_Development_Environment