JSFiddle - React, Tailwind, and code Playground
HTML
<image id="myImage">
JavaScript
var img,canvas,context,dataURL;
img = new Image();
img.src = 'http://www.google.com/intl/en_com/images/srpr/logo2w.png';
canvas = dojo.create('canvas');
context = canvas.getContext("2d");
context.drawImage(img,0,0);
dataURL = canvas.toDataURL("image/png");
alert(dataURL);
dojo.byId('myImage').src = img.src;