Why is it important?
W3C have defined a specification showing how the HTML of website should be written, ensuring there is high compatibility and accessibility, and following best practices. W3C compliance is considered one of the best assurances that the website has been built with accessibility in mind which is a legal requirement.
Having W3C compliant sites, will:
- Work more reliable across web browsers
- Be more accessible and usable
- Work on mobile or tablet devices
- Rank better in search engines
- Mark Up Validator: Checks the HTML or XHTML format of web documents
- Link Checker: Checks anchor tags in HTML or full websites that have broken links
- CSS Validator: Checks the CSS format that has any invalid elements