maskOpacity: Number

Sets the opacity for masked region of Slider.

Default: 0.6
Examples: .1, .5, 1, … 
var stockChart = new CanvasJS.StockChart("container",
{
 .
 .
 navigator: {
   .
   .
   slider: {
     maskOpacity: .2
   },
   .
   .
 },
 .
 . 
});
stockChart.render();
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