In this example, a placemark is added to the map that, when clicked, opens a balloon panel with the specified content.
To set the placemark style from a set of built-in styles, use the preset option. The API has five preset styles for placemarks (the corresponding keys are shown in parentheses):
For each style there are 16 colors. The API allows you to also specify custom colors for placemarks for all styles, except 'islands#stretchyIcon'. For information on how to set custom colors for placemarks, see the following example.