These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Decides in what dimensions the user can zoom scrolling the wheel. Can be one
of x, y or xy. In Highcharts Core, if not specified here, it will
inherit the type from chart.zooming.type. In Highcharts
Stock, it defaults to x.
Note that particularly with mouse wheel in the y direction, the zoom is
affected by the default yAxis.startOnTick and
endOnTick settings. In order to respect these settings,
the zoom level will adjust after the user has stopped zooming. To prevent
this, consider setting startOnTick and endOnTick to false.