These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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A CSS class name to apply to the tooltip, allowing unique CSS styling for each chart.
Note: The class is applied to the SVG element of the tooltip (the tooltip label group), not to a container div. This allows you to style the tooltip using CSS applicable to SVG elements.
When tooltip.outside is true, a separate
container div with class highcharts-tooltip-container is created
as the parent to the SVG tooltip element, but the className option
is still applied to the SVG element itself, not to the container.