Welcome to the Highcharts Gantt JS (gantt) Options Reference

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

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navigator.xAxis.plotBands.zIndex

The z index of the plot band within the chart, relative to other elements. Using the same z index as another element may give unpredictable results, as the last rendered element will be on top. Values from 0 to 20 make sense.