HTML5 got a lot of new cool tags and of course keeping traditional tags like <a> and <div>. To get an overview of all these tags have a look at this cool intuitive periodic table html5 style. Description: “Knowing all the HTML5 elements is important, but listing them out is a bit dry .. organizes the elements so nicely in a periodic table and provides an interactive feature to check a site’s HTML5 element weight. The site has great tooltips with links for further reading.”
Check out the Periodic Table of HTML5 Elements