Other than the meta tag, the others are W3C specifications: https://drafts.csswg.org/css-values/#calc-notation https://drafts.csswg.org/css-values/#calc-notati

Other than the meta tag, the others are W3C specifications: https://drafts.csswg.org/css-values/#calc-notation https://drafts.csswg.org/css-values/#calc-notation https://github.com/w3c/csswg-drafts/issues/1693#issuecomment-330909067 https://github.com/w3c/csswg-drafts/issues/1693#issuecomment...