Contributed to the python/typeshed repository by enhancing static type analysis for the HTMLParser.__init__ method within the html5lib typing stubs. Focused on improving type hinting, the work involved updating the method’s annotations to accept both string and TreeBuilder inputs, thereby enabling more precise checks with Pyright. This targeted feature addressed a specific gap in static analysis, supporting better type safety and developer tooling for Python projects that rely on html5lib. The approach demonstrated a strong understanding of static analysis and type hinting in Python, with careful attention to compatibility and correctness in type annotations for widely used parsing libraries.