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.