Sets the text of tooltip to be the given string, which is marked up with the [Pango text markup language]PangoMarkupFormat. Also see gtk.tooltip.Tooltip.setMarkup.
This is a convenience property which will take care of getting the tooltip shown if the given string is not null. #GtkStatusIcon:has-tooltip will automatically be set to true and the default handler for the #GtkStatusIcon::query-tooltip signal will take care of displaying the tooltip.
On some platforms, embedded markup will be ignored.
Get tooltipMarkup property.