# Welcome to the Highcharts Gantt JS (gantt) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

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# yAxis.tickPositioner

A callback function returning array defining where the ticks are laid out on the axis. This overrides the default behavior of tickPixelInterval and tickInterval. The automatic tick positions are accessible through `this.tickPositions` and can be modified by the callback. Since v12.6.0, the callback also receives `ctx` as the third argument, so that arrow functions can access the same context as regular functions using `this`.