UX Design and Development course


What is it?

A CSS analyzer that analyzes your CSS output.

Gives you output like:

{.contact .content .primary} and {article, #comments} share 5 rules

If you have multiple selectors sharing five or more rules (properties with the same value), that's likely a good opportunity for optimization (combine into new class or comma separate selectors elsewhere).

csscss will parse any CSS files you give it and let you know which rulesets have duplicated declarations.

What is it for?

One of the best strategies for me to maintain CSS is to reduce duplication as much as possible. It’s not a silver bullet, but it sure helps.

To do that, you need to have all the rulesets in your head at all times. That’s hard, csscss is easy. Let it tell you what is redundant.

How do I use it?

First you need to install it. It is currently packaged as a ruby gem:

$ gem install csscss

Then you can run it in at the command line against CSS files.

$ csscss path/to/styles.css path/to/other-styles.css

Run it in a verbose mode to see all the duplicated styles.

$ csscss -v path/to/styles.css

Run it against remote files by passing a valid URL.

$ csscss -v http://example.com/css/main.css

and much much more ....