HTML5 is rapidly gaining traction in the mobile application ecosystem. Many new smartphone browsers support it and most mobile developers are already using the language to build Web-based applications.  In addition, operators such as AT&T Mobility (NYSE:T) have started promoting it as a means of streamlining app development and expanding market reach for mobile software products. Research firm Strategy Analytics projects annual sales of HTML5 handsets will reach 1 billion units in 2013, up from 336 million in 2011. The transition in mobile to HTML5 is in its early stages, but analysts agree the technology is here to stay. What are the chief benefits to developers of HTML5? Special feature