For example a column chart with options:
axisX : { labelAngle: -45,
labelMaxWidth: 140,
labelAutoFit: true
}
the first label on the x-axis is truncated on the left side. Also there is a 5px padding on the canvas element which cannot be removed by CSS (the removal of this would be a first step).
The space from the left side of the canvas to the y-axis depends on the size of the y-labels, but it should depend on the size of the first x-label too, so it would not be truncated.