categoryAxis.highlight.border.widthNumber(default: 0)

The width of the category highlight border in pixels. By default the border width is set to zero which means that the border will not appear.

Example - set the category axis highlight border width

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