By Dan Carr – The HTML5 canvas is an interesting feature of this increasingly widespread web standard. With it you can draw dynamic content to any web page and add features like drawing tools, animation and graphic effects, and interactivity to your websites.
The HTML5 canvas is an invisible 2D grid that you can use to draw graphics and animations (See diagram). Any number of canvases can be added to an HTML page using the <canvas> tag.
The canvas tag itself is very simple. It defines an invisible resolution-dependent coordinate space at a given width and height. The coordinates run along two axes (x and y) starting at 0, 0 in the upper left corner. more> http://tinyurl.com/bptjsfo