[riquito]

Performance is penalized too. Since CSS rules are parsed from right to left and you have probably a lot of "li" tags, the rule would be very inefficient. Of course this doesn't matter in small pages.

[mthoms]

I was going to ask why that is as it seems counterintuitive at first glance. Instead, I Googled it and found the following (excellent) answer at StackOverflow: http://stackoverflow.com/questions/5797014/why-do-browsers-m...

I'm just provided the link here in case anyone else was wondering the same thing.

[rimantas]

It does not matter in any real life pages.

[riquito]

It did for Trello, to name an example (search for speed in http://blog.trello.com/refining-the-way-we-structure-our-css...).