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.
The Y axis value to serve as the base for the area, for distinguishing between values above and below a threshold. The area between the graph and the threshold is filled.
null, the scaling behaves like a line series with fill between the graph and the Y axis minimum.
-Infinity, the area between the graph and the corresponding Y axis extreme is filled (since v6.1.0).