4.3 Style sheets
See also: Techniques for styling XHTML using CSS
CSS
Document presentation must be defined using Cascading Style Sheets CSS1 and/or CSS2.1. Refer to 'Cascading Style Sheets', W3C website at http://www.w3.org/Style/CSS/
.
Linking style sheets
Styles should be contained in an external linked .css file, using the <link> element.
For example:
<link rel="stylesheet" type="text/css" href="css/mystyle.css" />