# 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.xAxis.crosshair.zIndex

The Z index of the crosshair. Higher Z indices allow drawing the crosshair on top of the series or behind the grid lines.