These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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The value on a perpendicular axis where this axis should cross. This
is typically used on mathematical plots where the axes cross at 0.
When crossing is set, space will not be reserved at the sides of
the chart for axis labels and title, so those may be clipped. In this
case it is better to place the axes without the crossing option.