These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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The name of a symbol to use for the border around the tooltip. Can
be one of: "callout", "circle" or "rect". When
tooltip.split
option is enabled, shape is applied to all boxes except header, which
is controlled by
tooltip.headerShape.
Custom callbacks for symbol path generation can also be added to
Highcharts.SVGRenderer.prototype.symbols the same way as for
series.marker.symbol.