I started an open source project that includes a canvas, but I was not sure which features I would like to include. As Ironfoot explains, it looks like the canvas was more designed for more benefit on the client side. I did capture captions using canvas, and the amount of Javascript was significant. The trick for me was to load it onto a modified surface. I am not sure how much this will be seen in the postback. If you are interested in contributing some features to the asp.net html canvas, check out my HTML5 ASP project .
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