Like most web developers, Ive heard a lot about the importance of valid html recently. Ive read about how it makes it easier for people with disabilities to access your site, how its more stable for browsers, and how it will make your site easier to be indexed by the search engines.
So when I set out to design my most recent site, I made sure that I validated each and every page of the site. But then I got to thinking while it may make my site easier to index, does that mean that it will improve my search engine rankings? How many of the top sites have valid html?
To get a feel for how much value the search engines place on being html validated, I decided to do a little experiment. I started by downloading the handy Firefox HTML Validator Extension (http://users.skynet.be/mgueury/mozilla/) that shows in the corner of the browser whether or not the current page you are on is valid html. It shows a green check when the page is valid, an exclamation point when there are warnings, and a red x when there are serious errors.
I decided to use Yahoo! Buzz Index to determine the top 5 most searched terms for the day, which happened to be World Cup 2006, WWE, FIFA,...