Add a custom tick to yAxis
The chart calculates the tick intervals for yAxis.
It is possible to set tickPositioner function or add custom tick positions, but what if I only want to add a single tick? Is it ok to override the entire native tick calculation function?
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lvil
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Use `tickPositioner`. In the callback, you have access to `this.tickPositions` so modify this array (e.g. by adding one tick) as you wish.
Docs: https://api.highcharts.com/highcharts/yAxis.tickPositioner
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tickPositioner or tickPositions options should work for this. Have you tried?
