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Project Description

CSS check

CSS check is a Python library/command line meant to help CSS developers.

The main use is to see which CSS rule are applied to more than one element in all your CSS files.


The tool can be installed using easy_install:

easy_install csscheck

You can then define an alias to run the tool (in your .bashrc or .profile file):

alias css_check="python -m csscheck.main"

If you have a buildout with the bin flder contained in your path, you can add this part:

recipe = zc.recipe.egg
eggs = csscheck

That will automatically create a new executable cs_check in the bin folder of your buildout.


When you simply run the css_check command created earlier, it will seek for all CSS files in the current directory (and sub-directories) and provide the list of CSS rules applied to more than one element. For example:

Rule "display: block" -  used 4 times:
 - header
 - nav
 - article
 - footer

Rule "background: #008BCD;" -  used 3 times:
 - #main > header
 - #main > nav > ul > li
 - #main > footer

You can also specify the directory in which the CSS files must be checked, using the -d option:

css_check -d media/green_theme

You can also check for which elements a CSS rule is applied. To do so, you can use the -r or --rule= option. For example:

css_check  --rule="display: block"

Those options will check all rules that contain the one you asked for. So if you run css_check -r background, the output will be:

Selectors for which "background: #F60;" is applied:
 - #main > header > nav

Selectors for which "background: #89BEFC;" is applied:
 - body

Selectors for which "background: #008BCD;" is applied:
 - #main > header
 - #main > nav > ul > li
 - #main > footer

You can use a strict rule checking using the -R or --exact_rule option. In that case, you’ll get an exact match. Running css_check -R background will not give any result.

The tool also allows to know which rules are applied to a selector, using the -s or --selector option. For example, running css_check -s footer will output all rules applied for selectors containing the work footer:

Rules applied for "#main > footer a:hover":
 - text-decoration: underline

Rules applied for "#main > footer a":
 - color: #FFF

Rules applied for "#main > footer li":
 - display: inline

Once again, you can specify the exact selector, using options -S or --exact_selector. Running the command css_check -S footer will only output this:

Rules applied for "footer":
 - display: block

The option used to specify the CSS directory is compatible with all other options. The other options can’t be mixed (you can’t specify a selector and a rule for example).

Change log for CSSCheck

1.0 (2012-01-11)

  • created product. [vincent]
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