These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Decides how the data label will be rotated relative to the
perimeter of the sunburst. Valid values are circular, auto,
parallel and perpendicular. When circular, the best fit
will be computed for the point, so that the label is curved
around the center when there is room for it, otherwise
perpendicular. The legacy auto option works similiar to
circular, but instead of curving the labels they are tangent to
the perimiter.
The rotation option takes precedence over rotationMode.