These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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A callback function to place the tooltip in a custom position. The
callback receives three parameters: labelWidth, labelHeight and
point, where point contains values for plotX and plotY telling
where the reference point is in the plot area. Add chart.plotLeft
and chart.plotTop to get the full coordinates.
To find the actual hovered Point instance, use
this.chart.hoverPoint. For shared or split tooltips, all the hover
points are available in this.chart.hoverPoints.
Since v7, when tooltip.split option is enabled,
positioner is called for each of the boxes separately, including
xAxis header. xAxis header is not a point, instead point argument
contains info: { plotX: Number, plotY: Number, isHeader: Boolean }
The return should be an object containing x and y values, for example
{ x: 100, y: 100 }.