# 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.gantt.animation

Enable or disable the initial animation when a series is displayed. The animation can also be set as a configuration object. Please note that this option only applies to the initial animation of the series itself. For other animations, see chart.animation and the animation parameter under the API methods. The following properties are supported:

- `defer`: The animation delay time in milliseconds.

- `duration`: The duration of the animation in milliseconds. (Defaults to `1000`)

- `easing`: Can be a string reference to an easing function set on the `Math` object or a function. See the Custom easing function demo below. (Defaults to `easeInOutSine`)

Due to poor performance, animation is disabled in old IE browsers for several chart types.