Other types of validation
In addition to HTML validation, webmasters can check other website documents. The second most important document which should be checked is the CSS file.
The most common errors in the CSS:
- Compound Values Errors (too many values)
- Typographical Errors (eg, Invalid dimension)
- Whitespace Errors
- Legacy Errors
To verify the CSS code use W3C validator
Webmasters should also validate RSS-feed and compliance with copyright requirements of Section 508.