HTML5 introduces many new tools that helps developer to build games. To develop a game programmers used to use Adobe Flash but now most of the capabilities of Flash specially for simple games are available in HTML5.
Canvas, one of the new element that HTML5 offers is particularly useful for creating a game area inside the browsers. Canvas – as the name suggests -provides the area for drawing and animating multiple elements inside it.
I have built a simple typing game with HTML5. Maybe in the future I get the time to make it a little more interesting than it is now.