The web pages that are being developed today are very poorly composed. Syntactically incorrect HTML code may be in use in many browsers even if it does not follow HTML rules. Browsers employ heuristics to handle these poorly written Web pages. However, devices that are enabled through web (such as PDAs or cellular phones) cannot handle these flawed and poorly composed websites. The HTML's evolution came up when XHTML application developers started developing in XHTML which is also known as the extended Hypertext Markup Language. The XHTML is basically a combination of HTML and XML. The key to success behind XHTML application developers’ was the net Consortium (W3C). When XML was introduced, a two-day workshop was held to discuss whether the latest version of HTML in XML was needed or not. The XHTML application developers came to the conclusion after much discussion that this was just the language that they had been looking for.
The version of XHTML that is supported by browsers usually is XHTML 1.0.The XHTML 1.0 has three other alternate versions. These three alternative versions of XHTML 1.0 are as follows:

XHTML 1. 0 Strict – It is employed by exceptionally clean structural markup; the CSS (Cascading Style Sheet) language can be used with this version to find the desired font, color. It also helps in finding the desired layout effects.
XHTML 1. 0 Transitional – The transitional version of XHTML is employed by web developers with web pages that are accessed by general public and for those who take advantage of XHTML features including style sheets by expert XHTML application developers.
XHTML 1. 0 Frameset – It helps in partitioning the Web browser window into a number of frames.
At cooperative computing XHTML application developers have the pioneered the web designing for many years. This work down the years of software website development has now enabled the XHTML application developers to deliver nothing but the best at prices that are easily affordable and hard to resist. XHTML application developers make it their top priority that the environment of their website is light and extremely user friendly. The website designed by cooperative computing are designed in a way which makes them the best fit for the purpose that they have been developed and designed to fulfill.