Worked on the mermaid-js/mermaid repository to address a targeted issue affecting timeline diagram customization. Focused on fixing the timeline.leftMargin configuration bug, ensuring that the left margin in Mermaid diagrams is now rendered according to user specifications. This change improved the accuracy and visual fidelity of timeline diagrams, reducing the need for manual adjustments and minimizing user confusion around diagram spacing. The solution was delivered as a focused, low-risk update, demonstrating careful technical execution in front-end development. Utilized TypeScript and expertise in diagramming libraries to enhance the reliability and configurability of timeline rendering within the Mermaid project.