titleFontStyle: String

Sets the Font Style of Axis Title. It can be set to one of the below options.

Default: “normal”
Options: “normal”, “italic” , “oblique” 
var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 axisX:{
   titleFontStyle: "italic",
 },
 .
 .
});
chart.render();
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