Here's a useful tool that combines a number of validation services into one tool: Total Validator is available as an online service, a desktop tool and a Firefox extension (you can get all from their web site).
Not only does the tool validate your site according to W3C specs but it also:
More features are planned, including CSS validation, but it is already a very complete package for a single tool. Well worth having.
I included a pretty comprehensive list of useful Firefox extensions in a previous post.
Posted on: May 20, 2006 | 1 Comment