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The border configuration options.

<div id="stock-chart"></div>
<script>
$("#stock-chart").kendoStockChart({
    dataSource: {
        data: [
            { date: new Date("2023/1/1"), open: 100, high: 110, low: 95, close: 105 },
            { date: new Date("2023/1/2"), open: 105, high: 115, low: 100, close: 110 }
        ]
    },
    dateField: "date",
    valueAxis: {
        crosshair: {
            visible: true,
            tooltip: {
                visible: true,
                border: {
                    color: "red",
                    width: 2
                }
            }
        }
    },
    series: [{
        type: "candlestick",
        openField: "open",
        highField: "high",
        lowField: "low",
        closeField: "close"
    }]
});
</script>

The color of the border.

Default: "black"

<div id="stock-chart"></div>
<script>
$("#stock-chart").kendoStockChart({
    dataSource: {
        data: [
            { date: new Date("2023/1/1"), open: 100, high: 110, low: 95, close: 105 },
            { date: new Date("2023/1/2"), open: 105, high: 115, low: 100, close: 110 }
        ]
    },
    dateField: "date",
    valueAxis: {
        crosshair: {
            visible: true,
            tooltip: {
                visible: true,
                border: {
                    color: "blue"
                }
            }
        }
    },
    series: [{
        type: "candlestick",
        openField: "open",
        highField: "high",
        lowField: "low",
        closeField: "close"
    }]
});
</script>

The width of the border.

Default: 0

<div id="stock-chart"></div>
<script>
$("#stock-chart").kendoStockChart({
    dataSource: {
        data: [
            { date: new Date("2023/1/1"), open: 100, high: 110, low: 95, close: 105 },
            { date: new Date("2023/1/2"), open: 105, high: 115, low: 100, close: 110 }
        ]
    },
    dateField: "date",
    valueAxis: {
        crosshair: {
            visible: true,
            tooltip: {
                visible: true,
                border: {
                    width: 3
                }
            }
        }
    },
    series: [{
        type: "candlestick",
        openField: "open",
        highField: "high",
        lowField: "low",
        closeField: "close"
    }]
});
</script>