A (very) small library that counts selectors in a CSS file.
This is mainly useful to detect when your CSS files have crossed the 4095 selector limit imposed by Internet Explorer 9 and lower.
gem install css_counter
require 'css_counter'
css = <<-EOS
h1 { color: red }
h2 { color: green }
EOS
CssCounter.new(css).selectors
=> 2
To ensure none of the compiled CSS files in your rails app exceed the IE selector limit, there’s a rake task you can run as part of a build process.
Add css_counter to your application Gemfile, and then run:
bundle exec rake css_counter:check_selectors