# 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.

# plotOptions.gantt.stickyTracking

Sticky tracking of mouse events. When true, the `mouseOut` event on a series isn't triggered until the mouse moves over another series, or out of the plot area. When false, the `mouseOut` event on a series is triggered when the mouse leaves the area around the series' graph or markers. This also implies the tooltip when not shared. When `stickyTracking` is false and `tooltip.shared` is false, the tooltip will be hidden when moving the mouse between series. Defaults to true for line and area type series, but to false for columns, pies etc.

Note: The boost module will force this option because of technical limitations.