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This option sets the DOCTYPE to be used in the editable area. The actual rendering depends on the value set here.
For example, to make the editor rendering engine work under the XHTML 1.0 Transitional:
FCKConfig.DocType = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">' ;
As of FCKeditor 2.6.1, if the DocType setting is explicetlly set to the HTML4 doctype, the editor will not produce tags like <br /> but <br> instead.