title: How can I draw a "transparent stroke" with Raphael.js
body: <p>I am attempting to draw the path of a graph so that the path is transparent and the rest of the canvas is not. This way I can use the canvas as a mask and fill the path with different colors using html elements. Kind of like this: </p>
  
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    <img src="https://i.stack.imgur.com/vppYf.png" alt="enter image description here">
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