You can write full HTML text description. This description is shown when you show map by Map menu item, module or plugin
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For both demo pages I used one placemark definition with different parameters to show.
I like Margit-sziget (Margaret Island, остров Маргит), therefore it is map center :)
Moreover you can add full description
This description is shown only when you show map by Placemark menu item.
This description can be disabled by setting Show Placemark full description to No
You can also add Image and/or Image Galery to placemark view. It will be shown on the other demo page