During May 2026, this developer focused on improving data visualization reliability in the streamlit/streamlit repository by addressing a regression affecting Vega-Lite chart tooltips within modal dialogs. Using TypeScript and Python, they resolved an issue where invisible SVG layers blocked pointer events, preventing tooltips from appearing on hover. Their solution involved resetting pointer-events on SVG helper paths, restoring expected interactivity for users inspecting data in dialogs. They extended end-to-end test coverage and performed thorough manual validation to ensure tooltip behavior remained stable. This work enhanced front end maintainability and reduced user friction, supporting high-quality data exploration in Streamlit applications.