JS_Harris - 2:04 am on Jul 18, 2013 (gmt 0)
I tried to create a site with the most horrendous code I could to make the site 'look' right but throw the most errors possible in tools like the W3 validator. I managed to get a simple page to have over 1000 errors and elements on the page moved depending on browser used, and not in an intentional way. On page css, tables etc... it was bad.
result: It ranked just fine and got no complaints from visitors. Obsolete or not - don't waste time on css hacks.