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 ...

CSE HTML Validator Pro ($69 direct) is an impressive Windows tool for HTML validation, link checking, and more. Validator Pro combines a text editor and integrated Web browser with sophisticated and ...

Software that checks the validity of tags in an HTML document. Browsers treat errors differently, such as a start tag without an end tag, a lack of quotes or extra quotes. Unless an HTML page is ...

We say that Tim Berners-Lee invented the World Wide Web, and that's certainly true. But, we can boil the Web down to three specific technologies: URLs (for uniquely identifying resources on the ...

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 ...