as simple as possible, but no simpler, it lets you open an HTML page (or pages, in succession) in a dialog box, mess around with it, then check for any elements that were leaked.
a test tool for web applications. Selenium tests run directly in a browser, just as real users do. And they run in Internet Explorer, Mozilla and Firefox on Windows, Linux, and Macintosh. No other test tool covers such a wide array of platform.