fontStyle: String

Sets the Font Style of ToolTip Content. It can be set to one of the below options.

Default: “italic”
Example: “normal”, “italic” , “oblique” 
var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 toolTip:{
   fontStyle: "italic",
  },

 .
 .
});
chart.render();
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