Really nice. I think it would be more helpful if the properties were ordered in a logical order (by "type" of properties) instead of alphabetical order.
I thought so too, but looking at chrome css usage stats, flexible stuff is really low on the list. Its rising fast, but currently unused on the majority of the web.
I disagree, I think it's much easier to search for a property by name. It's really hard to objectively categories every property, one person would put one property in one type another one would not. Sorting it alphabetically helps all users to find the property
But a user who was searching for a property with a particular name would presumably use Ctr-f/Cmd-f to search, rather than scrolling through the whole list to find it.
I agree with this viewpoint. Additionally, even if the categorization is to some degree arbitrary, at least it beats alphabetical order which ends up being the most arbitrary (well other than just rolling the dice).