Dynamic HTML and XHTML are really not new specifications of HTML, but rather a new way of looking at and controlling the standard HTML codes and commands. DHTML, XHTML, and CSS allow for greater control of web pages and ability to combine events with changes initiated in the pages.
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Cascading Style Sheets (CSS) are a very powerful tool for the web site developer. They allow for consistent look and feel across all pages of a web site, while giving much more control over the layout and design - more so than pure HTML ever did. Styles are normally saved in external .css files. External style sheets enable changes to the appearance and layout just by editing one single CSS document. In other words, it allows for the separation of the layout and design from the content and code.