Worked on the robertpenner/fluentui repository to enhance iframe focus detection by delivering the IFrame Focus Polling Responsiveness Enhancement feature. This involved reducing the pollDuration parameter in the useIFrameFocus React hook from 1000ms to 100ms, resulting in improved responsiveness for iframe contexts. The change was implemented using TypeScript and focused on frontend development best practices, ensuring minimal risk and straightforward verification within continuous integration workflows. The scope of the update was intentionally lean, targeting a specific performance bottleneck without introducing unnecessary complexity. No bugs were addressed during this period, with efforts concentrated on delivering this targeted feature improvement.