These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Fill opacity for the area. When you set an explicit
fillOpacity is not applied. Instead, you should define the
opacity in the
fillColor with an rgba color definition. The
fillOpacity setting, also the default setting, overrides the alpha
component of the
In styled mode, the fill opacity can be set with the
.highcharts-area class name.