Part of the "hmm" factor for me on this one is that these "anchor" and "anchor-size" functions really just seem like cute names for a more generic "get position

Part of the "hmm" factor for me on this one is that these "anchor" and "anchor-size" functions really just seem like cute names for a more generic "get position of element" and "get size of element" functions. So it's a big departure from the way I always imagined CSS (a tree of styles where an element was affected mostly/completely only by its ancestors/siblings) vs this proposal cracking that model by letting styles interact between elements "horizontally" across different trees. We already kind of did that with grid I guess. It feels like one step closer to imperative code in CSS rather than declarative, but I'll take it over JS to achieve this effect.