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@alanstearns @TerribleMia @tabatkins Good pointer; it seems this has been the reason: “[…] @\if clashes with [Sass’s] existing rule. @\else-if and @\else are fine. We did some brainstorming, and I think @\when works pretty well.” Thanks Sass. github.com/w3c/csswg-drafts/issues/112#issuecomment-221669910