Selenium provides an open source
software testing framework that is ideal for web-based applications
and sites. Developers can write the tests in the form of HTML tables
or can code them in any popular programming language. Moreover, Selenium
can be deployed on any of the modern web browsers to test web site performance.
Selenium has a Firefox extension for test case recording and editing
in IDE (Integrated Development Environment). Developers can deploy Selenium
on Macintosh, Linux or Windows.

Software Testing Tips Using
Selenium

• For setting variables,
  it is preferable to use storedVars['x'] rather than ${x}. Although,
  ${x} is shorter, it does not identify the real value and cannot be assigned
  anything. storedVars['x'] represents stored user variables of Selenium
  and is the best to use.
• You should adopt
  storeEval to run a Javascript code to define functions in Selenium IDE.
  You can store the result in a variable that you can make use of for
  proceeding commands.
• Use the ‘assert’
  command rather than ‘verify.’ The ‘verify’ command in Selenium
  will allow the test case to run, but will fail at the end. In case of
  the ‘assert’ command, the test will stop.
• You can use captureEntirePageScreenShot
  command of Selenium, as it works perfectly with IDE/HTML. You could
  use this command for critical scenarios, such as for issue debugging
  in case you schedule test suites. However, it may not work well with
  the Java programming language. In this case, you can try the capturescreenshot
  command.
• If you wish to keep
  the test case in ‘HTML,’ you should ideally write a wrapper in .net/jsp
  for the test case.
• When you notice
  problems occurring while recording in Firefox, disable Selenium IDE
  and enable it again. To do this, click on Tools->Add on -> Selenium
  IDE. Ensure that you restart the browser after that.
• In case the browser
  does not get killed automatically, consider killing it manually.
• You may need to
  use lots of xpath in your test and Firebug allows you to get xpath by
  right clicking on the element. From the context menu choose "Copy
  Xpath" and paste it. You may be required to replace "/html/body/"
  with "//".