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Yet another bonus of canvas, something vaguely akin to:

var canvas = document.getElementById("canvasElement");

var image = canvas.toDataURL("image/png");

document.write('<img src="' + img + '">');

To be fair, that's not an intrinsic limitation so much as a browser implementation limitation.

File a bug report?

It sounds like you're looking for the SVG Crowbar: http://nytimes.github.io/svg-crowbar/