These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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The pixel width of each node in a, or the height in case the chart is
inverted. For tree graphs, the node width is only applied if the marker
symbol is rect, otherwise the marker sizing options apply.
Can be a number or a percentage string, or auto. If auto, the nodes
are sized to fill up the plot area in the longitudinal direction,
regardless of the number of levels.