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The border of the icon.

<div id="chart"></div>
<script>
  $("#chart").kendoChart({
    series: [{
      type: "scatter",
      data: [[1, 2], [2, 3]]
    }],
    yAxis: {
      notes: {
        data: [{
          value: 1.3,
          icon: {
            border: {
              width: 2,
              color: "red"
            }
          }
        }]
      }
    }
  });
</script>

The border color of the icon.

<div id="chart"></div>
<script>
  $("#chart").kendoChart({
    series: [{
      type: "scatter",
      data: [[1, 2], [2, 3]]
    }],
    yAxis: {
      notes: {
        data: [{
          value: 1.3,
          icon: {
            border: {
              color: "red"
            }
          }
        }]
      }
    }
  });
</script>

The border width of the icon.

<div id="chart"></div>
<script>
  $("#chart").kendoChart({
    series: [{
      type: "scatter",
      data: [[1, 2], [2, 3]]
    }],
    yAxis: {
      notes: {
        data: [{
          value: 1.3,
          icon: {
            border: {
              width: 2
            }
          }
        }]
      }
    }
  });
</script>