During a two-month period, Jukka Jalkanen focused on enhancing layout robustness and predictability in the mozilla/gecko-dev and servo/stylo repositories. He addressed critical bugs in CSS anchor positioning by refining default offset behaviors and ensuring correct layout order, which improved cross-engine consistency and prevented layout regressions. Jalkanen’s work involved expanding test coverage for edge cases, implementing guardrails against division-by-zero errors, and reinforcing code quality through targeted reviews and debugging. Utilizing C++, Python, and deep knowledge of web standards, he delivered targeted fixes that improved reliability in layout engines, demonstrating thoroughness and attention to detail in complex frontend development scenarios.