Demo: http://repo.tiye.me/demo-of-sass-chrome/
sudo gem install sass
# You need at least SASS `3.3.0` to run this demo.
sass --sourcemap sass/style.sass css/style.css
View index.html
in a browser, inspect the CSS.
Paul Irish gave: a demo at Google IO: http://www.youtube.com/watch?v=x6qe_kVaBpg
Getting started with CSS sourcemaps: https://medium.com/p/b4daab987fb0
About CSS SourceMap in Chrome: https://developers.google.com/chrome-developer-tools/docs/css-preprocessors#toc-using-css-source-maps