The DefaultAllowHtmlDraw static property allows you to specify whether HTML text formatting is enabled for the BaseListBoxControl descendants and in-place editors by default. The control's AllowHtmlDraw property (see BaseListBoxControl.AllowHtmlDraw and RepositoryItem.AllowHtmlDraw) overrides the global setting specified with the DefaultAllowHtmlDraw property.
For more details on controls that support HTML text formatting and the available HTML tags, see the HTML Text Formatting topic.