Validating a website is the process of ensuring that the pages on the website conform to the norms or standards defined by various organizations.
For example, if you use HTML entity encoding on user input before it is sent to a browser, it will prevent most XSS attacks.
If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, Mobile OK content, or to find broken links, there are other validators and tools available.
As an alternative you can also try our non-DTD-based validator.
Make note of your the User ID, password and expiration date.
To ensure that the application is robust against all forms of input data, whether obtained from the user, infrastructure, external entities or database systems. This weakness leads to almost all of the major vulnerabilities in applications, such as Interpreter Injection, locale/Unicode attacks, file system attacks and buffer overflows.