# 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.polygon.states.hover.halo.size

The pixel size of the halo. For point markers this is the radius of the halo. For pie slices it is the width of the halo outside the slice. For bubbles it defaults to 5 and is the width of the halo outside the bubble.