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The border configuration options.

<div id="sparkline"></div>
<script>
$("#sparkline").kendoSparkline({
    type: "column",
    valueAxis: {
        crosshair: {
            visible: true,
            tooltip: {
                visible: true,
                border: {
                    color: "blue",
                    width: 2
                }
            }
        }
    },
    series: [{
        data: [10, 15, 8, 12]
    }]
});
</script>

The color of the border.

Default: "black"

<div id="sparkline"></div>
<script>
$("#sparkline").kendoSparkline({
    type: "column",
    valueAxis: {
        crosshair: {
            visible: true,
            tooltip: {
                visible: true,
                border: {
                    color: "#ff0000"
                }
            }
        }
    },
    series: [{
        data: [10, 15, 8, 12]
    }]
});
</script>

The width of the border.

Default: 0

<div id="sparkline"></div>
<script>
$("#sparkline").kendoSparkline({
    type: "column",
    valueAxis: {
        crosshair: {
            visible: true,
            tooltip: {
                visible: true,
                border: {
                    width: 2,
                    color: "blue"
                }
            }
        }
    },
    series: [{
        data: [10, 15, 8, 12]
    }]
});
</script>