# 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.tooltip.format

A format string for the whole shared tooltip. When format strings are a requirement, it is usually more convenient to use `headerFormat`, `pointFormat` and `footerFormat`, but the `format` option allows combining them into one setting.

The context of the format string is the same as that of the `tooltip.formatter` callback.