Systems and methods for represent and manipulate (i.e., processing) the underlying structure of a structured document (e.g., a mark-up language document), while maintaining a What You See Is What You Get (WYSIWYG) environment. The traditional WYSIWYG editor view is paired with a Visual Document Structure Indicator (VDSI) pane to allow for both WYSIWYG and structure editing within a single interface. The VDSI pane includes left pane and upper pane, which are configured along the left and top borders, respectively. The document editor allows document content to be created, edited, and maintained in the WYSIWYG environment while keeping document structure information available to the user.