categoryAxis.highlight.border.opacityNumber(default: 1)

The opacity of the category highlight border. By default the category highlight border is opaque.

Example - set the category axis highlight border opacity

<div id="chart"></div>
<script>
$("#chart").kendoChart({
  categoryAxis: {
    categories: ["2012", "2013"],
    highlight: {
      visible: true,
      border: {
        opacity: 0.5
      }
    }
  },
  series: [
    { data: [1, 2, 3] }
  ]
});
</script>