Link: http://marakana.com/courseware/web_2.0/xhtml_with_css.html
Source Author or Organization: Marakana.com

XHTML with CSS courseware covers the principles of XHTML, what it is as well as how to migrate from HTML to XHTML. The section on CSS describes the Cascading Style Sheet format and how to use CSS to separate the look and feel from the data. Advanced sections cover positioning elements with CSS, CSS and JavaScript event handling and basics of Search Engine Optimization.