Worked on the CesiumGS/cesium repository to enhance label rendering stability and maintainability in 3D graphics applications. Addressed misalignment issues by refining how label positions are clamped under heightReference, ensuring consistent visual output across both 2D and 3D modes. Refactored the label clamped position logic to use a dedicated accessor, improving code clarity and reducing the risk of future errors. Expanded unit test coverage to verify correct propagation of clamped positions and background billboard behavior. Applied code quality improvements through linting and formatting updates in JavaScript, leveraging WebGL and front end development skills to deliver robust, maintainable solutions.