The initial and unset CSS wide values are already in development in Microsoft Edge. The all shorthand property is now on the backlog with a priority of medium. You can track status updates at https://dev.modern.ie/platform/status/cssallshorthand/
CSS Box Alignment is now on the Microsoft Edge backlog. You can track the status at https://dev.modern.ie/platform/status/boxalignment/fvsch commented
@Martinspire You can get this with Flexbox, but you also get a slew of other behaviors (elements getting aligned and stretched and whatnot) that you may not want.
This extracts one feature from Flexbox (and to some extent table cells) and makes it a general-purpose one. Like webdesigners have wanted for, roughly, 10 years.