Originally Posted by ElMiko
I'm sorry, but I'm not following the practical consequence of this... how is margin-width distinct from margin -top -bottom -right and -left values?
Width is the total width of the page by default but it can be less. Think of it as a viewport. for example the width could be 80% of the page width. Margins are measured from that point. So they are on top of the width. The nice thing about width it is even spaced from the centered page so you can set it based on how wide you want the text to be.