A config setting defining the default module for rendering tiddler.text to HTML when tiddler.type is None. In core TiddlyWeb it is raw meaning that plain text is presented. In TiddlyWebWiki WikklyText is used. On TiddlySpace twikifier is used.

The default config settings looks like this:

'wikitext.default_renderer': 'raw',

The value is a string representing a Python module.