Web developer Mark Wilkie releases the w3ctextarea Firefox extension, which validates HTML entered into a web form. Many bloggers know that one mistake or unclosed tag in a post can bork up a site's ...

Here is a free Mac OS X utility by Todd Ditchendorf for all you concerned web designers out there. XML Nanny allows you to validate your XML and XHTML documents (either locally or over a network) via ...

I'm trying to validate this page as XHTML1.0 strict and I'm having trouble trying to decipher what it's telling me I'm doing wrong. Here's the validation page. First, the encoding thing. I don't have ...

You may have run across the W3C in your web development and SEO travels. The W3C is the World Wide Web Consortium, and it was founded by the creator of the World Wide Web, Tim Berners-Lee. This web ...