This is really cool, and very nicely packaged. I agree with some other commenters that showing sample html would be a good improvement, but in general this is a

This is really cool, and very nicely packaged. I agree with some other commenters that showing sample html would be a good improvement, but in general this is awesome. That said... Is it acceptable to animate `box-shadow` these days? Thought that was a pure framerate killer on mobile.