Welcome to the Highcharts JS (highcharts) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

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series.xrange.dataLabels.nullFormat

Format for points with the value of null. Works analogously to format. nullFormat can be applied only to series which support displaying null points i.e heatmap or tilemap. Does not work with series that don't display null points, like line, column, bar or pie.