These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Allows setting a key to switch between zooming and panning. Can be
one of alt, ctrl, meta (the command key on Mac and Windows
key on Windows) or shift. The keys are mapped directly to the key
properties of the click event argument (event.altKey,
event.ctrlKey, event.metaKey and event.shiftKey).