Worked on stabilizing viewport segment handling in the w3c/csswg-drafts repository, focusing on browser development and web standards. Addressed a bug where viewport segment retrieval could return multiple segments on non-folded or regular devices, leading to UI inconsistencies. Improved the segmentation logic using IDL to ensure a single viewport segment is always returned, aligning with developer feedback and reducing edge-case errors. This change enhanced UI reliability across devices by preventing multiple segments from appearing in rendering and interactions. The work demonstrated attention to detail in standards compliance and contributed to more predictable behavior for developers working with viewport segmentation features.