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How to script Canvas?

Last Modified: 2014-08-28
scripting help needed for this specific URL: http://jsfiddle.net/ezanker/4hfkb/6/

Simply, I am trying to script a clearCanvas drawing feature via a clearRect function. Can anyone let me know how to do this?

What I think are the snippets needed to script this are as follows, but I do not know how the JavaScript area gets resolved within the web page in order to clear Canvas1:

<a href="#canvas1">clearCanvas</a>

function clearCanvas() {            
            context.clearRect(0, 0, canvas.width, canvas.height);

Any scripting solution that properly "runs" on the JSFIDDLE site - and clears the drawing on the Canvas area - would be greatly appreciated. Thank you!
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