In December 2012, W3C has published the complete definition of HTML 5 specification. Already most of the browser vendors have implemented support for HTML 5 and you can expect future versions of browsers will have complete support of the specification. In the introduction of HTML 5, web developers faced some challenges to support their markup in non-HTML 5 browsers. This added some cost to web development. Now web developers can expect better browser support and all the browser vendors already announced their commitment to this standard.