function getTextOffset(fontSize, font, textBaseline) {
        var text = 'test',
            canvas = document.createElement('canvas'),
            width = 300,
            height = parseFloat(fontSize) * 2;

        canvas.width = width;
        canvas.height = height;

        var cctx = canvas.getContext('2d');
        cctx.textBaseline = textBaseline || 'middle';
        cctx.font = font;
        cctx.fillStyle = 'red';
        cctx.fillText(text, 0, 0);

        var imgdata = cctx.getImageData(0, 0, width, height);
        var d = imgdata.data;

        var offsetX = 10000000,
            offsetY = offsetX;

        for (var y = 0; y < height; y++) {
            for (var x = 0; x < width; x++) {
                var n = (y * width + x) * 4;
                if (d[n + 3] > 0) {
                    if (y < offsetY) {
                        offsetY = y;
                    }
                    if (x < offsetX) {
                        offsetX = x;
                    }
                }
            }
        }

        return { x: offsetX, y: offsetY };
    }