# 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.

# series.xrange.states.hover.brightness

How much to brighten the point on interaction.

In styled mode, the hover brightening is by default replaced with a fill-opacity set in the `.highcharts-point:hover` rule.