These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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The type of axis. Can be one of linear, logarithmic, datetime,
category or treegrid. Defaults to treegrid for Gantt charts,
linear for other chart types.
In a datetime axis, the numbers are given in milliseconds, and tick marks are placed on appropriate values, like full hours or days. In a category or treegrid axis, the point names of the chart's series are used for categories, if a categories array is not defined.