These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Proximity snap for graphs or single points. It defaults to 10 for mouse-powered devices and 25 for touch devices.
Note that in most cases the whole plot area captures the mouse
movement, and in these cases
tooltip.snap doesn't make sense. This
applies when stickyTracking
true (default) and when the tooltip is shared