@property | CSS-TricksThe @property is totally new to me, but I see it’s headed to Chrome, so I suppose it’s good to know about! There is a draft spec and an “intent to ship” document. The code from that document shows: @property --my-property { syntax: "<color>"; initial-value: green; inherits: false; } We’ve got more information on all this now in our Complete Guide to Custom Properties. That is the CSS exact-equival
