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Form validation. Forms are vital pages in a site since they create value from a visit 

through leads (via a contact us form for example), forum postings or the shopping trolley 

and checkout. It is vital that they use  cross-  browser web standards and that they use an 

appropriate approach to check user inputs are valid.

Web application frameworks and application servers

Web application frameworks

 provide a foundation for building dynamic interactive 

websites and web services. They use standard programming conventions or Application 

Programming Interface (APIs) in combination with data storage to achieve different tasks