Have you ever visited a website and noticed the compliance or validation badge? The badge usually says something like “HTML Valid”, “CSS Valid” or has the HTML or CSS word in it with a big check mark. There are many variations, but the idea is to portray the page as “VALID”.

I got to seeing this enough that I began to wonder what it meant. And why was it important that a page be “valid”.

This article looks at what validation means, why it’s important, and how to valid your web pages to the industry standard.