gistfile1.txt

        /**
         * italic
         * 
         * Tests whether the browser supports faux-italic text in canvas when
         * the font itself does not have an italic version (or else the italic
         * version has not been loaded into memory).
         * 
         * I do this by using the native font Impact, which does not have a bold
         * or italic version, drawing it to a canvas, and checking whether
         * anything about the canvas bit-data is different.
         * 
         * @see    http://stackoverflow.com/questions/14489363/detect-bold-and-italic-support
         * @see    http://stackoverflow.com/questions/15128803/cannot-draw-italic-text-in-firefox-canvas
         * @access public
         * @return Boolean
         */
        italic: function () {
            if (_italic === undefined) {
                var canvas = document.createElement('canvas'),
                    context = canvas.getContext('2d'),
                    raw = {};
                canvas.width = 1000;
                canvas.height = 30;
                context.font = 'normal 16px impact';
                context.fillText('string', 10, 20);
                raw.normal = canvas.toDataURL('image/png');
                context.clearRect(0, 0, canvas.width, canvas.height);
                context.font = 'italic 16px impact';
                context.fillText('string', 10, 20);
                raw.italic = canvas.toDataURL('image/png');
                _italic = raw.normal !== raw.italic;
            }
            return _italic;
        }
    };
})();
// 0
// 0