Developed a self-contained 3D triangle visual demo using only HTML and CSS for the you-dont-need/You-Dont-Need-JavaScript repository, focusing on delivering a lightweight, accessible UI prototype without JavaScript dependencies. The work emphasized semantic markup, CSS animations, and responsive design principles to create an interactive visualization that expands the project’s design toolkit. Asset organization and disciplined version control were maintained throughout the process, ensuring repository quality and maintainability. This feature supports marketing and onboarding efforts by providing a clear, JS-free example of advanced front end development techniques, demonstrating practical application of CSS and HTML for modern, visually engaging user interfaces.