2026-03 Monthly Summary — marimo-team/marimo Key features delivered: - Draggable Range Slider: Enables dragging the entire selected range on the range slider with real-time updates to values and state, improving precision and user experience. Commit: d87972f6739cb06b77939d56ed062ea34220d877 (feat: support dragging range slider track to move entire range (#8698)) - DataFrame Download Filename Reflects Variable Name: Replaces the default filename with the actual variable name at download time by adding a runtime name retrieval utility and updating download logic and tests. Commit: 92ff13c38cb123881df4a3ca33fee579bc426f56 (feat: use variable name as download filename in dataframe viewer (#8811)) - Root cause and fixes are documented in the commit, including tests validating correct filenames. Major bugs fixed: - Resolved the download filename regression by ensuring filenames reflect the actual variable name instead of a generic df.csv, via get_bound_name() based lookup and runtime variable name resolution. Tests added to verify behavior. Overall impact and accomplishments: - Significantly improved user experience and data export reliability: users can drag ranges with precision and export files named after the actual data variable, reducing confusion and support overhead. - Strengthened data workflow fidelity and reproducibility through accurate export naming and added test coverage. Collaborative effort acknowledged through co-authored contributions. Technologies/skills demonstrated: - Frontend interaction design: pointer events handling, range slider state management - Runtime utilities and data-binding: get_bound_name() usage and bound-name resolution - Test-driven development: added tests validating filename logic - Collaboration and code quality: cross-team coordination and co-authored commits.