Cascading Style Sheets (CSS) - It is used to govern the display of the HTML, DHTML and XML documents by the Web Browser. Extensible Hypertext Markup Language (XHTML) is an outgrowth of HTML, XHTML is a superset of the HTML commands, including the capabilities of HTML and adding to them, XHTML allows for the execution of programs written in Extensible Markup Language (XML) and it is itself extensible, meaning that it allows for new commands and features to be added.

Answered by nisha , an ibibo Master, at 2:24 PM on November 24, 2007