./bin/css-coverage --html ./test/test.html --css ./test/test.css --verbose
Each entry needs to contain:
selectors (id is not necessary; the index is the id)
Example: [['body'], ['div.foo']]
Note: It's a 2-dimensional array because each rule can have multiple selectors
Then, PhantomJS will output:
count (id is not necessary; the index is the id)
and css-coverage will translate that back (using sourcemap) to file, lineStart, lineEnd