Check Out the Web’s Hidden Treasures

Warning: This site is technical, so you may prefer to pass this link to your IT staff when things seem awry.

W3 HTML Validator, http://validator.w3.org/

The World Wide Web Consortium is responsible for specifications for the Web, and it provides free HTML mark-up validation programs. (Few Web pages truly are compliant with specs.) You may need to wade through many minor warnings to find real errors, but it’s worth it.