Did I learn? Yes, but perhaps I would have learned more doing the Popcorn intro as I already knew some HTML and CSS. I did learn about two new tools for learning HTML/CSS and I also saw several very inspiring X-Ray Goggles and Thimble projects. The X-Ray Goggles tool could also be very handy to illustrate critical evaluation of information found on the web.
Part of the success in learning through making depends upon appealing and relevant projects that provide an appropriate level of challenge and support.