

With an XHTML browser, you can:
XHTML: A better all-around Markup Language
There are many reasons why XHTML (Extensible Hypertext Markup Language) is gaining ground: it incorporates HTML but is actually based on XML, so it's more flexible and it's still relatively easy to learn. But the most important thing is that it helps make pages look consistent on a maximum number of browsers and devices - like a PC and mobile phone. This is why standards bodies such as W3C (World Wide Web Consortium) and OMA (Open Mobile Alliance) have chosen XHTML as the next standard markup language for both fixed Internet development as well as for mobile service pages.
There's even a version that's optimized for mobile devices: XHTML MP (Mobile Profile), which is basically the same as XHTML, but it leaves out the tags that wouldn't make sense on a device with a smaller screen.