One of the main changes from HTML4 to HTML5 is that the new specification breaks a few
of the boundaries that browsers have been confined to. Instead of restricting user
interaction to text, links, images and forms, HTML5 promotes multimedia, from a generic
<object> element to a highly specified <video> and <audio> element, and
with a rich API to access in pure JavaScript. Native multimedia capability has a few
benefits. For instance, end users have full control over the multimedia. The native controls
of browsers allow users to save videos locally or email them to friends. Also, HTML5 video
and audio are keyboard-enabled by default, which is a great accessibility benefit.