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= Reference =
 * http://en.wikipedia.org/wiki/Canvas_element
 * http://wiki.moztw.org/%E7%94%A8_Canvas_%E7%95%AB%E5%9C%96
 * http://billmill.org/static/canvastutorial/index.html
 * http://www.c3dl.org/index.php/tutorials/tutorial-1-browsers/