This document provides an introduction and overview of JsUnit, an open source unit testing framework for JavaScript that runs tests directly in web browsers. It describes the key components of JsUnit, including test functions, test pages, test suites, and a test runner. It also discusses options for automating test runs on multiple browsers and machines, such as using StandaloneTest to run tests on local browsers, and DistributedTest to coordinate running tests on remote machines. The goal is to easily run JavaScript unit tests across all target browsers and operating systems.