# 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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# exporting.fallbackToExportServer

Whether or not to fall back to the export server if the offline-exporting module is unable to export the chart on the client side. This happens for certain browsers, and certain features (e.g. allowHTML), depending on the image type exporting to. For very complex charts, it is possible that export can fail in browsers that don't support Blob objects, due to data URL length limits. It is recommended to define the exporting.error handler if disabling fallback, in order to notify users in case export fails.

Since v13, PDF client-side export dependencies are not auto-loaded unless `exporting.libURL` is defined (or the scripts are already present on the page). If dependencies are missing and no `exporting.libURL` is configured, a console warning is emitted on chart load. Disabling fallback without defining `exporting.error` will throw the underlying error message when available.