The TranscludeWidget treats any contained content as a fallback if the target of the transclusion is not defined (ie a missing tiddler or a missing field).
* ''inline'' mode recognises character formatting such as emphasis, links
* ''block'' mode recognises all the ''inline'' formatting, and adds block formatting such as tables, headings and lists
Usually, the mode is determined by whether the transclude widget itself has been parsed in block or inline mode. This can be overridden with the `mode` attribute.
For example, consider tiddler "A" with this content: