# JS API Reference

# Welcome to the Highcharts JS 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.

# plotOptions.scatter.stacking

Whether to stack the values of each series on top of each other. Possible values are `undefined` to disable, `"normal"` to stack by value or `"percent"`. When stacking is enabled, data must be sorted in ascending X order. A special stacking option is with the streamgraph series type, where the stacking option is set to `"stream"`. The second one is `"overlap"`, which only applies to waterfall series.