Why some properties does not work with a:visited?

In my browser, Chrome on Mac OS, text-decoration and background color does not work for the following 开发者_如何学编程code:

http://jsfiddle.net/5CYHZ/10/

Why would that be so?

Mozilla removed the ability to style most aspects of :visited links for privacy reasons. I would assume the same is true of Chrome and others.