Worked on the rommapp/romm repository to deliver a credentialless attribute for the YouTube iframe, enhancing COEP compatibility and strengthening security for embedded external content. Focused on front end development using Vue.js and JavaScript, the approach involved precise, minimal code changes to improve browser compatibility and reduce cross-origin risks. The update improved both reliability and performance of media embeds while maintaining clear documentation to support future COEP compliance. No major bugs were addressed during this period, but the work demonstrated a strong understanding of HTML iframe handling, security best practices, and careful commit traceability within a focused development cycle.