Closure Library

The Closure Library is a broad, well-tested, modular, and cross-browser JavaScript library. You can pull just what you need from a large set of reusable UI widgets and controls, and from lower-level utilities for DOM manipulation, server communication, animation, data structures, unit testing, rich-text editing, and more.

The Closure Library is server-agnostic, and is intended for use with the Closure Compiler. At Google, it's used in Gmail, Docs, Sites, Books, Reader, Blogger, Calendar, Picasa Web Albums, and more.

Cool! How do I get it?

Check out the repository with Subversion:

svn checkout http://closure-library.googlecode.com/svn/trunk/

Where do I learn more?

This is repository home page. To learn more about the Closure Library, you can read our documentation, the generated API reference, or the wiki (see GettingStartedWithClosureLibrary).

You can browse the well-documented source, and if you have questions, ask other users and developers on the Closure discussion list.

Also see Google Code Search's excellent code browsing UI.