These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Sequence of sorting orders used when toggling sorting from the user interface (for example by clicking the column header).
The sequence can contain any number of values, in any order, with
duplicates allowed. Allowed values are: 'asc', 'desc', and null.
If the sequence is empty ([]), sorting toggles become a no-op while
the sortable UI can still be shown.
This option can be set in both columnDefaults.sorting and
columns[].sorting.