labelFontStyle: String

Sets the font style of label (text) shown in Range Buttons.

Default: “normal”
Options: “normal”, “italic”, “oblique” 
var stockChart = new CanvasJS.StockChart("container",
{
 .
 .
 rangeSelector: {
   buttonStyle: {
     labelFontStyle: "italic",
     .
     .
   }
 }
 .
 . 
});
stockChart.render();
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