# Welcome to the Highcharts Maps JS (highmaps) Options Reference

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

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# plotOptions.mapline.tooltip.pointFormatter

A callback function for formatting the HTML output for a single point in the tooltip. Like the `pointFormat` string, but with more flexibility. Since v12.6.0, the callback also receives `ctx` as the first argument, so that arrow functions can access the same context as regular functions using `this`.