This CSS attribute can be used to specify the icon used for a closing custom tag (e.g. </CustomTag>). This attribute should not be used with an empty tag. The icon for empty tags can be specified through the ephox-icon attribute.
A URL which maps to an image which is to be used as the icon for this custom tag. This URL can be either relative or absolute. If relative URLs are specified they are resolved in relation to either the BaseURL (if specified) or the page in which EditLive! for XML is embedded (if the BaseURL is not specified).
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