I don't hear already about HTML Multimedia Development. First i search on Google then i am able to tell you.
HTML5 introduces a number of new elements and attributes that reflect typical usage on modern websites. Some of them are semantic replacements for common uses of generic block (<div>) and inline (<span>) elements, for example <nav> (website navigation block), <footer> (usually referring to bottom of web page or to last lines of HTML code), or <audio> and <video> instead of <object>.[30][31][32] Some deprecated elements from HTML 4.01 have been dropped, including purely presentational elements such as <font> and <center>, whose effects are achieved using Cascading Style Sheets. There is also a renewed emphasis on the importance of DOM scripting (e.g., JavaScript) in Web behavior.
With the help of multimedia elements in HTML5, now web developers can able to use different multimedia benefits for their site which are being used with the help of following elements : <audio> : For adding sound content <video>: For adding video and movie file <track> : For adding tracks for video and audio <embed> : For adding external content
HTML5 is making many of the Java and Flash technologies obsolete in the sense of ease. I have been using youtube in HTML5 and it is great.
Thanks Alan for this information. These tags have actually changed the HTML5. I have started creating my website in HTML5 .. I think these new tags and features in HTML5 will show wonders in future too