When the web page or web browser is validated following are the different types of testing that has to be performed.

- Functionality testing
- User Interface testing
- Security testing
- Compatability testing
- Load testing
- Stress testing
- Volume testing
- Usability Testing

Most prolific errors that are faced while testing web pages are the
i. connectivity errors,
ii. functionality errors such as any of the controls or links are not performing the desired activities. For example a link to page 3 may goto page 4 etc.,
iii. Performance errors, which is most common error and the application reaction when more load is happenned.
iv. Data storage errors such as whether the data given as input in the front end is saved correctly in the data base located in the server