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Simply by submitting the code of their pages to the W3C validator site at http://validator.w3.org copying and pasting it, or if your website is online, indicating the absolute link. The W3C will provide some nice buttons to insert into their pages to indicate that the site is valid XHTML!
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CSS (Course)
Web Design and Accessibility according to W3C CSS and XHTML. Starting from 29 €. |
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HTML (Course)
The markup language for the Web from 29 €. |
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Web Design (Course)
Design Web Sites with HTML, CSS and Dynamic HTML. From 39 €. |