Contributed updates to the mdn/browser-compat-data repository by enhancing Deno compatibility documentation for JavaScript’s Map and WeakMap objects. Focused on aligning documentation with Deno 2.6.7, the work clarified support for features like Map.getOrInsert and upsert, ensuring developers have accurate, cross-environment guidance. Leveraged skills in JavaScript compatibility, data management, and documentation to reduce ambiguity in compatibility data, making it easier for users to understand feature support across platforms. Utilized JSON to maintain and update structured compatibility entries, keeping the repository current and reliable for the developer community. No bug fixes were recorded during this period, emphasizing feature documentation.