These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Callback function to format each of the series' labels. The this
keyword refers to the series object, or the point object in case of
pie charts. By default the series or point name is printed. Since
v12.5.0, the callback also receives ctx as the first argument, so
that arrow functions can access the same context as regular
functions using this.