HTML and CSS

Should I use em,% or px for my fill margins in CSS?

If I use px, my text will overflow if the zoom filler? Usually people use and why? The spill, if I do and put the zoom px? Thanks, 10 points for best answer

Select the size for Web design: Quest Holy Grail: http://www.alistapart.com/articles/holygrail/ http://www.elated.com/articles/choosing-dimensions-for-your-web-page-design / How to create flexible sites quickly using standards like XHTML and CSS: 960 http://www.ibm.com/developerworks/web/library/wa-rapid/ Interconnected System: http://960.gs/ careful the size of the police: Ron http://www.w3.org/QA/Tips/font-size

Videotutorial de CSS. Parte 2. Sintaxis y unidades. @import de CSS