These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Whether or not data-points with the value of null should be interactive.
When this is set to true, tooltips may highlight these points, and this
option also enables keyboard navigation for such points. Format options
for such points include nullFormat and nullFormater.
Works for these series: line, spline, area, area-spline,
column, bar, and* timeline.