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 point.id,
point.fromNode.id, point.toNode.id, series.name, 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.