Yahoo uses the Graded Browser Support policy (http://developer.yahoo.com/yui/articles/gbs/ http://developer.yahoo.com/yui/articles/gbs/) for a reason. It's beca

Yahoo uses the Graded Browser Support policy (http://developer.yahoo.com/yui/articles/gbs/ http://developer.yahoo.com/yui/articles/gbs/) for a reason. It's because we check what % of our users use each browser and support the appropriate ones. You can bet that if Yahoo is still choosing to support IE6 it's because a decent slice of the internet still uses it. That said, IE <6 is on our C-grade list. This means we actively block them from getting JS/CSS and display a "nag" message with upgrade information.