Algjör grunn regla ef þú vilt smíða gæða vefsíðu:

“In Progressive Enhancement (PE) the strategy is deliberately reversed: a basic markup document is created, geared towards the lowest common denominator of browser software functionality, and then the designer adds in functionality or enhancements to the presentation and behavior of the page, using modern technologies such as Cascading Style Sheets or JavaScript (or other advanced technologies, such as Flash or Java applets or SVG, etc.)”

http://en.wikipedia.org/wiki/Progressive_Enhancement
http://webmonkey.wired.com/webmonkey/03/21/index3a.html?tw=design
http://hesketh.com/publications/progressive_enhancement_paving_way_for_future.html
http://css-discuss.incutio.com/?page=ProgressiveEnhancement