Welcome to the Highcharts JS (highcharts) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

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plotOptions.cylinder.tooltip.headerFormat

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.