# 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.data.partialFill.amount

The amount of the X-range point to be filled. Values can be 0-1 and are converted to percentages in the default data label formatter.