Why Use XHMTL?
Using XHTML means that your code will be compatible with all browsers that are written to XHTML standards. All of the major browsers meet this standard including Internet Explorer, Netscape, Mozilla, and Opera.
With the increase in web pages on cell phones and PDA (handheld) computers, HTML will soon be fading away into history and all web pages will be expected to be written following the XHTML standards.
Writing to XHTML standards means your web pages will work consistently with browsers and devices that haven't even been invented yet. A good example is the Chrome browser that Google introduced in 2008. All the XHTML pages on the Web displayed without a problem when viewed with the Chrome browser even though most of them had been written years before Chrome was even imagined by the Google engineers.
Using valid XHTML will also increase the SEO (Search Engine Optimization) of your client's pages. That's because search engines such as Google can evaluate an XHTML page much easier and accurately because it follows the basic XML rules which were designed for computers to extract information from other systems.
