Web-based HTML and CSS validation tools

... a website that validation usually results in ... can use to validate your website's ... reason not to validate! Here are some ... just that: W3C Markup Validation Service The ...for checking the validity of HTML/XHTML...for checking the validity of cascading style...

Opera - most HTML code isn't standards compliant

...of websites displaying the W3C validation badges actually ... code that will validate. According to Opera,... systems - WordPress pages validated only 9% of ... difficulty in producing W3C compliant markup is ... as mobile phones, valid markup becomes increasingly ...

Accessibility - are 'trustmarks' the answer?

... recommended guidelines issued by the W3C these can often be interpreted ...about search engines, is particularly valid, since we believe that accessibility... whether ALT tags are valid descriptions ) has been an ... ( Nomensa used the W3C guidelines as the basis ...