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
value or "percent".
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 "stream".
The second one is "overlap", which only applies to waterfall
series.