Preprocessor Example

gistfile1.txt

.Element {
  display none @ <320px; block @ >=320px
  font-size 12px @ 320px; 20px @ 1280px
}

.Element {
  display (
    <320px: none
    block
  )

  :hovering(.Parent) {
    background-color red
  }
  
  :before {
    content ""
  }
  
  // Compile time error
  .Sub {
    possible notpossible
  }
}