Due to usability purpose the web sites made by developers are highly interactive nowadays and for this developers need to include fluid animations, stream video, play music and Social Network sites like Facebook and Twitter into the websites.
Cleaner markup / Improved Code
HTML 5 will enable web designers to use cleaner, neater code, we can remove most div tags and replace them with semantic HTML 5 elements.
IT’S THE FUTURE, GET WITH IT!
Start using it right now, whether you are just simplifying and making your markup more semantic or you are gonna build some sick new mobile game that will take over the world — who knows, maybe you can start selling stuffed animal versions of your gaming characters too.
Mobile browsers have fully adopted HTML5 so creating mobile ready projects is as easy as designing and constructing for their smaller touch screen displays — hence the popularity of Responsive Design.
Web workers is a tool for spawning background threads to speed up the browse application processing. The API allows developers to make background workers that run scripts simultaneously to the main page script. This allows for faster thread-like processing with coordination via message-passing mechanisms.
HTML 5 offers enhanced forms with improvements to text inputs, search boxes and other fields and provides better controls for validating data, focusing, interaction with other page elements on the page and various other improvements.