An Introduction to the Raphael JS Library | Nettuts+: "When we draw with Raphael, we do so onto a canvas. This canvas, which we’ll reference in a variable called ‘paper’, is created using the
Raphael() object. We always specify the width and height of the canvas, but have the option of also specifying either a) the absolute position of
the canvas relative to the viewport, or b) an element ‘container’ that the canvas is drawn inside."
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