These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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The size of the inner diameter for the pie. A size greater than 0 renders a donut chart. Can be a percentage or pixel value. Percentages are relative to the pie size. Pixel values are given as integers. Setting overridden by thickness.
Note: in Highcharts < 4.1.2, the percentage was relative to the plot area, not the pie size.