maskInverted: String

Setting maskInverted to true will invert the masked and unmasked region of Slider. Try out the same in the example below.

Default: false
Options: true, false 
var stockChart = new CanvasJS.StockChart("container",
{
 .
 .
 navigator: {
   .
   .
   slider: {
     maskInverted: true
   },
   .
   .
 },
 .
 . 
});
stockChart.render();
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