> stable spec
I'd really like to see more vendor prefixes for support. I mean, basic flexbox support was rolled out quickly, and the spec changed like three times. Mozilla has a new 'avoid vendor prefixes' thing, which I think is the wrong approach. I'd rather just use a tool like autoprefixer to generate all of the browser-incompatible CSS until we can all agree.
I can't believe I am praising IE for being forward thinking! (they have full CSS grid support, per the draft)