I use Dash, and it’s great. But you know what doc is wrong? The CSS transition one! It’s pulled from the Mozilla docs, and it’s not up to date!
So, for my sanity and yours:
transition: time timing-function property delay
transition: .25s ease-in-out opacity 0
Note: .25s is _the magic number_
Also, if you’re not hip to it, check out autoprefixer
– Ian out.