This is a brain dump of a session given by cat lover Eden Rohatensky.

  • CSS is limited because it is designed to be simple
  • Simplicity leads to limited expressibility
  • CSS preprocessors allow for adding a programming paradigm over top of CSS
  • Using a CSS preprocessor allows for writing more maintainable code
  • SASS - SASS uses a Ruby preprocessor but you can survive without Ruby as SASS is basically just a DSL
  • There are two different sytaxes for SASS: SCSS is close to the CSS syntax where the origianal SASS dialect is whitespace delimited
  • Variables are denoted using a $ symbol

  • Eden uses Crunch as a tool for SASS

  • Supports lists which are a handy construct for creating elements which are similar
  • Less - Less is written in JavaScript
  • Less uses @ to denote a variable
  • Eden uses Compass for LESS
  • Both tools support nesting of classes so you can apply the same rules for a set of classes like a:hover and a:visited
  • There are some libraries of mixins to deal with things like vendor prefixes. This allows cleaning up

-webki-border-radius: 5px; -moz-border-radius: 5px; -ms-border-radius:5px; -o-border-radius: 5px; border-radius: 5px;

  • Lots of functions in both but you end up in
  • luma is the perceived lightness of a color
  • The compilers for SASS and Less provide some logic checking to prevent you from writing syntactically incorrect code
  • The errors which come out of sass


SASS seems like a more powerful but slightly more complicated language. I wonder if source maps could be used to transition from CSS back to the source files. Gosh I hope there are already tools written to perform SASS/Less compilation as part of the VS build process and that I dont have to write it myself.