For modifying the chart at runtime. See the class reference.
These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Options for the data labels appearing on top of the nodes and links.
For sankey charts, data labels are visible for the nodes by default,
but hidden for links. This is controlled by modifying the
nodeFormat, and the
format that applies to links and is an empty
string by default.