Worked on the google/blockly repository to enhance accessibility by standardizing ARIA role usage for decorative elements throughout the codebase. Addressed an accessibility inconsistency by replacing the ARIA 'presentation' role with 'none', ensuring that screen readers properly ignore non-essential visuals. Updated the aria.ts utility and reordered ARIA role definitions for greater consistency, while extending and updating tests to verify correct ARIA role handling. Consolidated these changes into a single, well-documented commit to streamline code review and future maintenance. The work involved JavaScript, TypeScript, and DOM manipulation, focusing on improving accessibility coverage without introducing new features.