changed drastically since XHTML 1.0 was first introduced. People and society use the internet differently compared to when XHTML 1.0 was introduced back in 2000 This is because of the amount of devices available today IMS (2010)
XHTML 1.0 evolved the web in 2000 but complicates the implementation of common features such as video and audio. HTML5 vs Adobe Flash - Third party plugins cannot be used on handheld devices HTML5 is about markup and structure CSS3 is just decoration and how a page looks