Worked on improving HTML parsing correctness in the python/cpython repository by addressing a nuanced bug in the HTMLParser module. Focused on ensuring that named character references within attribute values are only unescaped when properly terminated, in strict accordance with HTML5 specifications. This targeted fix, implemented using Python and leveraging regular expressions and unit testing, prevents incorrect parsing in edge cases where references are not followed by valid terminators. The change enhances reliability for downstream users processing HTML content and web data, reducing rendering inconsistencies and aligning the parser’s behavior more closely with modern web standards for robust HTML handling.