There's a warning about it in the intro, and a huge yellow warning sign next to said pattern. They did acknowledge that it was an experimental CSS feature. Tha

There's a warning about it in the intro, and a huge yellow warning sign next to said pattern. They did acknowledge that it was an experimental CSS feature. That said, this looks really useful! I wonder if there are more resources like this? So often with CSS I write layouts from scratch when all I want to do is implement something that should be really common