Worked on the mdn/browser-compat-data repository to address a specific issue with Safari’s handling of the ::highlight CSS selector when combined with user-select: none. Focused on improving web compatibility data, the developer identified and fixed a bug where Safari incorrectly ignored this selector combination. The solution involved updating both the compatibility data and related documentation, ensuring that developers relying on this dataset have accurate information. Using CSS and Markdown, the work enhanced the clarity and reliability of browser compatibility reporting. This contribution improved the dataset’s accuracy for web developers and strengthened the overall quality of Safari CSS compatibility information.