This document summarizes a presentation about full-stack web design and prototyping features like @mentions in the browser using HTML, CSS, and JavaScript. The presentation discusses using prototyping tools like Flow Diagrams and Wireframes to design features before developing them. It provides the example of redesigning the @mentions feature for WordPress by prototyping it in a static GitHub repo and then porting the interactions to mobile apps. The speaker advocates for prototyping interfaces quickly in the browser rather than waiting for production-level code, and provides tips like doing research first and knowing when to hand off to developers.