Chris Wanstrath, known by his Twitter handle @defunkt, delivered a presentation at the SF JS Meetup, which focused on various topics related to JavaScript. During the presentation, Wanstrath, a prominent figure in the tech community, shared insights and experiences likely drawn from his extensive background in software development. Though the specifics of the talk are not detailed in the source text, such meetups typically facilitate knowledge exchange and networking among JavaScript enthusiasts and professionals. These events often cover a wide range of subjects, including new JavaScript features, best practices, and innovative uses of the language in different applications.