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.x, point.y, series.
name and series.color and other properties on the same form.
point.y can be extended by the
tooltip.valueSuffix variables. 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.