code: function (fontSize) {
  		fontSize = pInt(fontSize || 11);
  
  		// Empirical values found by comparing font size and bounding box height.
  		// Applies to the default font family. http://jsfiddle.net/highcharts/7xvn7/
  		var lineHeight = fontSize < 24 ? fontSize + 4 : mathRound(fontSize * 1.2),
  			baseline = mathRound(lineHeight * 0.8);
  
  		return {
  			h: lineHeight,
  			b: baseline
  		};
  	}
docs: Utility to return the baseline offset and total line height from the font size