![qa1](http://www.web3.lu/wp-content/uploads/2008/07/qa1.png)
Quality
Laste update : 15 February 2011
The W3C offers a markup validation service to check the markup validity of web documents in HTML, HTML, SMIL, MathML, etc. or specific content such as RSS/Atom feeds or CSS stylesheets.
The present weblog is valid XHTML 1.0 code.
![vcss1](http://www.web3.lu/wp-content/uploads/2008/07/vcss1.gif)
W3C CSS
![valid-xhtml10-blue1](http://www.web3.lu/wp-content/uploads/2008/07/valid-xhtml10-blue1.png)
W3C HTML
To create valid XTHML code, you need to declare a DOCTYPE, specify the character encoding, indicate the language and include a minimum of tags in the head (title) and the body sections.
![woolly-icon1](http://www.web3.lu/wp-content/uploads/2008/07/woolly-icon1.png)
CSS
If you use the EmbedIt WordPress plugin, you must use the following structure to embed your special code in a wordpress entry to get valid XHMTL 1.0 code.
</p> <div> your code </div> <p>
To get the right MIME type for valid XHTML 1.1 code, the webpage needs an .xhtml extension.
The code YouTube shows on the embed field is not valid XHTML! Tools4Noobs offers a code generator to create valid xhtml code for embedded youtube videos.
A unified W3C online validator is available at the Unicorn website.