These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Compare the values of the series against the first non-null, non-
zero value in the visible range. The y axis will show percentage
or absolute change depending on whether compare is set to "percent"
or "value". When this is applied to multiple series, it allows
comparing the development of the series against each other. Adds
a change field to every point object.