Site Inspector - User Manual
W3C – MarkUp Validation
The W3C (www.w3c.org) is an international standards organization in charge of markup languages (such as HyperText Markup Language, HTML, and eXtensible Markup Language, XML).
The W3C Markup Validation tool will check the markup language of the webpage for validation against the current standards.
What is Site Inspector?
Site Inspector is a powerful HTTP-client/server test application designed to pinpoint critical performance issues in your web site or web server that may prevent optimal experience for your site's visitors.