# 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.tooltip.pointFormatter

A callback function for formatting the HTML output for a single point in the tooltip. Like the `pointFormat` string, but with more flexibility.