W3C Markup Validation Service
From Wiki @ Karl Jones dot com
The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check HTML and XHTML documents for well-formed markup.
Markup validation is an important step towards ensuring the technical quality of web pages. However, it is not a complete measure of web standards conformance.
Though W3C validation is important for browser compatibility and site usability, it has not been confirmed what effect it has on search engine optimization.
External links
- Markup Validation Service @ W3C
- CSS Validation Service @ W3C
- W3C Markup Validation Service @ Wikipedia
