These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Whether to stack the values of each series on top of each other.
Possible values are
undefined to disable,
"normal" to stack by
When stacking is enabled, data must be sorted in ascending X order.
Some stacking options are related to specific series types. In the
streamgraph series type, the stacking option is set to
The second one is
"overlap", which only applies to waterfall