# 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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# plotOptions.series.sonification.defaultSpeechOptions.activeWhen.crossingUp

Track is only active when `prop` was below, and is now at or above this value.

If both `crossingUp` and `crossingDown` are defined, the track is active if either condition is met.