These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Determines color mode for sankey links. Available options:
from color of the sankey link will be the same as the 'from node'
gradient color of the sankey link will be set to gradient between
colors of 'from node' and 'to node'
to color of the sankey link will be same as the 'to node'.