These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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The HTML of the tooltip header line. The context is the
Point class.
Variables are enclosed in curly brackets. Examples of common
variables to include are x, y, series.name and series.color
and other properties on the same form. The point.key variable
contains the category name, x value or datetime string depending on
the type of axis. For datetime axes, the point.key date format can
be set using tooltip.xDateFormat.