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The border configuration options.

<div id="stock-chart"></div>
<script>
$("#stock-chart").kendoStockChart({
    seriesDefaults: {
        tooltip: {
            visible: true,
            border: {
                color: "#ff0000",
                width: 2
            }
        }
    },
    series: [{
        type: "line",
        data: [
            { date: new Date(2023, 0, 1), value: 10 },
            { date: new Date(2023, 0, 2), value: 20 },
            { date: new Date(2023, 0, 3), value: 15 }
        ],
    }]
});
</script>

The color of the border.

Default: "black"

<div id="stock-chart"></div>
<script>
$("#stock-chart").kendoStockChart({
    seriesDefaults: {
        tooltip: {
            visible: true,
            border: {
                color: "#ff0000"
            }
        }
    },
    series: [{
        type: "line",
        data: [
            { date: new Date(2023, 0, 1), value: 10 },
            { date: new Date(2023, 0, 2), value: 20 },
            { date: new Date(2023, 0, 3), value: 15 }
        ],
    }]
});
</script>

The width of the border.

Default: 0

<div id="stock-chart"></div>
<script>
$("#stock-chart").kendoStockChart({
    seriesDefaults: {
        tooltip: {
            visible: true,
            border: {
                width: 3
            }
        }
    },
    series: [{
        type: "line",
        data: [
            { date: new Date(2023, 0, 1), value: 10 },
            { date: new Date(2023, 0, 2), value: 20 },
            { date: new Date(2023, 0, 3), value: 15 }
        ],
    }]
});
</script>