Inefficient CSS Selectors

[ruinen]

I ran Google's PageSpeed against my site using ActiveScaffold. It reported 45 very inefficient rules, 47 inefficient rules, and 6 potentially inefficient uses of :hover. For example:

• .active-scaffold-header div.actions div.action_group li a    Tag key with 4 descendant selectors and Class overly qualified with tag and Class overly qualified with tag

I am a novice when it comes to CSS performance, but I wonder if there are worthwhile improvements to be made? If so, I'd be happy to investigate fixing this up. Anybody got any thoughts?

[Sergio Cambra]

Most of the tag.class could be only .class, maybe some selector need the
tag.class

In this case, probably div could be removed, and li probably too:
.active-scaffold-header .actions .action_group a

And maybe .actions could be removed too I'm not sure.

However, I'm not sure if performance is really bad due to many selectors, I
don't know how to measure it. If you want, try to fix it and test you get the
same results, and send pull requests, but please, don't make all changes in
one commit, I prefer small commits to test it.

If you need some help, ask me

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[ruinen]

Looks like Speed Tracer can show you the time spent on CSS style recalculation. So I will have an experiment and see if there is much to gain - https://developers.google.com/web-toolkit/speedtracer/