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

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

Feel free to search this API through the search bar or the navigation tree in the sidebar.

# navigator.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`.