These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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When the tooltip is shared, the entire plot area will capture mouse movement or touch events. Tooltip texts for series types with ordered data (not pie, scatter, flags etc) will be shown in a single bubble. This is recommended for single series charts and for tablet/mobile optimized charts.
See also tooltip.split, that is better suited for
charts with many series, especially line-type series. The
tooltip.split option takes precedence over tooltip.shared.