These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Fires when the legend item belonging to the pie point (slice) is
clicked. The this keyword refers to the point itself. One
parameter, event, is passed to the function, containing common
event information. The default action is to toggle the visibility of
the point. This can be prevented by calling event.preventDefault().
Note: This option is deprecated in favor of legend.events.itemClick.