Selenium is an open source tool for web application testing.This tool is primarily developed in JavaScript and browser technologies and hence supports all the major browsers on all platforms.
Selenium provides a test domain specific language (DSL) to write tests in a number of popular programming languages like Java, Ruby, Perl, Python, PHP, C#, HTML.
Selenium was originally developed by Jason Huggins, who was later joined by other programmers and testers at Thought works.
The browsers that are supported by Selenium are Internet Explorer, Mozilla Firefox, Google Chrome, Opera, and Safari.
Selenium runs on Windows, Linux and Macintosh operating systems.
Selenium enables Browser Compatibility Testing.
Selenium enables System Functional Testing.
How Selenium Works
Selenium uses JavaScript and Iframes to embed a test automation engine in your browser.
Selenium Core runs the test and interrogates the DOM.
Selenium RC server and Core communicate via AJAX.
Supported Environments:
The environments supported by Selenium are as below:
Browsers
| Browser | Selenium IDE | Selenium Remote Control | Selenium Core |
| Firefox 3 | Record and playback tests | Start browser, run tests | Run tests |
| Firefox 2 | Record and playback tests | Start browser, run tests | Run tests |
| IE 8 | not supported | Start browser, run tests | Run tests |
| IE 7 | not supported | Start browser, run tests | Run tests |
| Safari 3 | not supported | Start browser, run tests | Run tests |
| Safari 2 | not supported | Start browser, run tests | Run tests |
| Opera 9 | not supported | Start browser, run tests | Run tests |
| Opera 8 | not supported | Start browser, run tests | Run tests |
| Others | not supported | Partial support possible* | Run tests** |
Operating Systems
| OS | Selenium IDE | Selenium Remote Control | Selenium Core |
| Windows | Works in Firefox 2+ | Start browser, run tests | Run tests |
| OS X | Start browser, run tests | Run tests | |
| Linux | Works in Firefox 2+ | Start browser, run tests | Run tests |
| Solaris | Works in Firefox 2+ | Start browser, run tests | Run tests |
| Others | Should work in Firefox 2+ | Start browser, run tests* | Run tests** |
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