Finding the right balance between DOM and MVC is not easy - yet remains critical if you want to capture the flexibility of the DOM and the update capabilities of MVC. It is great to see Jeremy/BriteSnow pushing the limits and capturing some of the best practices.
The "Step 0" and "Step 5" tutorial examples are visually glitched in Opera. The card appears to show no information, but a look with Opera's development tools shows that .card-back seems to be visible, while .card-front isn't. They remain hidden regardless of any selection of projects I do. The rest of the examples in the tutorial are working great, though.
Yes, good point. We focused on Webkit and Firefox, but we should add opera. Will fix this in the next few days. It should be mostly CSS. Sorry about the inconvenience.
Done, fixed. Opera does not seem to support backface-visibility, so, we do not flip it now in Opera, but we do for other browsers.