Since id's are unique anyway what's the difference here?

Readability. You know which element it refers to.

I've also seen similar with classes, but that seems easier to understand

It might be also about selector specifity. (<http://www.stuffandnonsense.co.uk/archives/css_specificity_wars.html#resources>)

--
Jan Brasna aka JohnyB :: www.alphanumeric.cz | www.janbrasna.com
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