# 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.maskInside

Whether the mask should be inside the range marking the zoomed range, or outside. In Highcharts Stock 1.x it was always `false`.