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Why do we need the html5 canvas element, when the same can be achieved through embedded svg?
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http://people.mozilla.com/~vladimir/xtech2006/ has nice comparison.
With canvas you don't have to deal with the DOM, which leads to faster and easier to write code. SVG is a mess as a specification, too...
an illustration: My blog engine (blogger) doesn't support SVG (it's not a XHTML document). I wrote a tool converting SVG to the canvas element: http://plindenbaum.blogspot.com/2009/11/tool-converting-svg-to-canvas_22.html