These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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A predefined shape or symbol for the marker. Possible values are "circle", "square", "diamond", "triangle" and "triangle-down".
Additionally, the URL to a graphic can be given on the form
url(graphic.png). Note that for the image to be applied to
exported charts, its URL needs to be accessible by the export
Custom callbacks for symbol path generation can also be added to
Highcharts.SVGRenderer.prototype.symbols. The callback is then
used by its method name, as shown in the demo.