Experimental htmlwidget to get a screenshot of the results of htmlwidgets. Works only on svg for now.
http://stackoverflow.com/questions/11567668/svg-to-canvas-with-d3-js/23667012#23667012
http://stackoverflow.com/questions/4912092/using-html5-canvas-javascript-to-take-screenshots/6678156#6678156 http://html2canvas.hertzen.com/ http://stackoverflow.com/questions/5941631/compile-save-export-html-as-a-png-image-using-jquery
https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Drawing_DOM_objects_into_a_canvas
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