During December 2025, this developer enhanced accessibility in the Khan/wonder-blocks repository by updating the Card component’s Dismiss button to include aria-describedby. This adjustment provided additional context for screen readers, improving usability for assistive technology users while maintaining concise aria-labels and preserving UI semantics. The work demonstrated careful application of ARIA best practices and a focus on code quality, with thorough validation across the component to ensure stability. Utilizing React along with JavaScript and TypeScript, the developer prioritized a low-risk, standards-aligned feature rollout, collaborating across teams to support WCAG compliance without introducing new bugs or disrupting existing functionality.