Now this era of web 2.0 and HTML5 is very excellent discovery of w3,only Apples Safari is fully HTML 5 fully supported browser.The Microsoft internet explorer still does not reconize HTML 5 where as Mozilla/chrome also not fully supported to html5.HTML 5 has been designed to make things easier for browsers to render a web page, powerful applications, rich multimedia and stunning designs.

W3C tests HTML5 browser compatibility: