Google's common JavaScript library
Closure Library is a powerful, low-level JavaScript library designed for building complex and scalable web applications. It is used by many Google web applications, such as Google Search, Gmail, Google Docs, Google+, Google Maps, and others.
Why people like Closure Library
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Companies using Closure Library
Closure Library integrates with

Closure Library's Features
  • cross-browser functions for DOM manipulations and events, Ajax and JSON
  • high-level objects such as User Interface widgets and Controls