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 auto, circular, parallel and
perpendicular. When auto, the best fit will be
computed for the point. The circular option works similiar
to auto, but uses the textPath feature - labels are curved,
resulting in a better layout, however multiple lines and
textOutline are not supported.
The series.rotation option takes precedence over rotationMode.