Two technologies for presenting documents to humans:
  - CSS - Cascading Style Sheets (1996) 
    
      - Formatting model
 
      - Formatting properties (fonts, colors, margins...)
 
    
   
  - XSL - Extensible Style sheet Language
    
      - XSLT - XSL Transformations (1999)
        To transform an XML doc into another XML doc 
      - XSL-FO - XSL Formatting Objects
        Superset of CSS formatting model & properties 
    
   
Can also specify rendering in braille & synthesized voice.