Each type of text in the chart has a different set of styles applied by default, but if those styles are set to null, or if a particular style option is not set by default, the chart falls back on any style options you set in this option. Styles for specific types of chart text that may use this option as a fallback style are set in the following options: axis x labels style axis x textStyle axis y labels style axis y textStyle chartLabelStyle footer textStyle header textStyle hint contentStyle hint titleStyle legend textStyle legend titleStyle The style is defined in Raphael here is the documentation: http://raphaeljs.com/reference.html#Element.attr. The style is the “attr” method’s parameters.