During a two-month period, John worked on Esri/harfbuzz and w3c/csswg-drafts, focusing on code safety, documentation accuracy, and low-level C++ improvements. He addressed a critical bug in COLR format handling by making switch-case control flow explicit, which improved rendering reliability for color fonts and reduced the risk of logic errors. In addition, John updated documentation for the CSS Text Decoration Trim property to reflect current grammar, clarifying developer guidance. He also fixed undefined behavior in vector memory management, ensuring safe element destruction. His work demonstrated careful attention to runtime stability, maintainability, and clear technical communication using C++ and Markdown.