Widget.setTooltipMarkup
void setTooltipMarkup(string markup = null)Sets markup as the contents of the tooltip, which is marked up with the [Pango text markup language][PangoMarkupFormat].
This function will take care of setting #GtkWidget:has-tooltip to true and of the default handler for the #GtkWidget::query-tooltip signal.
See also the #GtkWidget:tooltip-markup property and [gtk.tooltip.Tooltip.setMarkup].
Parameters
markup | the contents of the tooltip for widget, or null |