HTML5 brings a host of new elements and attributes to allow developers to make their documents more easily understood by other systems especially search engines!, display data more uniquely, and take on some of the load that has required complex JavaScript or browser plug-ins like Flash and Silverlight to handle. Here are 10 new items in HTML5 that will make it easier for you to write your Web sites.
<video> and <audio>, <input>, <canvas>, <header> and <footer> are a few new ones. Read more
via 10 new HTML5 tags you need to know about | TechRepublic.