Worked on the mermaid-js/mermaid repository to address a complex bug involving self-referential edge label rendering in diagram visualizations. Focused on refining how cardinality labels and relationship titles are displayed on self-loops, the developer used JavaScript and SVG rendering techniques to prevent duplicate or misplaced labels. Defensive coding practices were applied to ensure that only cardinality labels were cleared while preserving relationship titles, and label properties were managed carefully across split sub-edges. The solution was validated through a comprehensive visual regression testing suite, and all changes were documented with a changeset, reflecting a collaborative and quality-driven approach to front end development.