Worked on the doocs/md repository to implement a Markdown rendering color customization and color management tool, focusing on enabling primary color support and introducing a utility for listing available colors. Leveraged Node.js and TypeScript to add polyfills for reliable MathJax loading in Node.js environments and created a run.mjs wrapper to streamline execution. Addressed build stability by inlining color and theme options, preventing CSS import issues, and enhanced type safety and error handling throughout the markdown rendering module. These contributions established a foundation for consistent theming across platforms and improved the developer experience, with all work delivered as part of a co-authored effort.