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XHTML stands for EXtensible HyperText Markup Language. XHTML was developed by the W3C to help web developers make the transition from HTML to XML. By migrating to XHTML today, web developers can enter the XML world with all of its attendant benefits, while still remaining confident in their content's backward and future compatibility.
XHTML has a more strict syntax rules in comparison of HTML. XHTML gives you a more consistent, well structured format so that your webpages can be easily parsed and processed by present and future web browsers. It also makes your website more easy to maintain, edit, convert and format in the long run.
Since XHTML is an official standard of the World Wide Web Consortium (W3C), your website will more likely will be more compatible to more browsers and will be rendered more accurately. XHTML combines strength of HTML and XML and XHTML pages can be rendered by all XML enabled devices.
XHTML defines a quality standard for your webpages, if you follows that then your web pages will be counted quality web pages and W3C certifies those pages with their quality stamp.
CSS is an Abbreviation. It stands for Cascading Style Sheet.CSS is used to style Web pages. But there is more to it than that. CSS is used to style XHTML and XML markup. This means that anywhere you have XML markup (including XHTML) you can use CSS to define how it will look.
CSS is also used to define how Web pages should look when viewed in other media than a Web browser. For example, you can create a print style sheet that will define how the Web page should print out and another style sheet to display the Web page on a projector for a slide show.
CSS is one of the most powerful tools a Web designer can learn because with it you can affect the entire mood and tone of a Web site. Well written style sheets can be updated quickly and allow sites to change what is prioritized or valued without any changes to the underlying XHTML.