# 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.

# annotations.typeOptions.background.xAxis

The xAxis index which should be used for annotation's sizes and points coordinates conversion.

This option is used for `rect` shape width, and all shapes point and points coordinates.