These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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The HTML of the point's line in the tooltip. Variables are
enclosed by curly brackets. Available variables are
series.color and other properties on the
same form. Furthermore, This can also be overridden for each
series, which makes it a good hook for displaying units. In
styled mode, the dot is colored by a class name rather than
the point color.