Apple is using W3C blessed standards: * https://github.com/w3c/csswg-drafts/issues/1693#issuecomment-330909067 https://github.com/w3c/csswg-drafts/issues/1693#

Apple is using W3C blessed standards: * https://github.com/w3c/csswg-drafts/issues/1693#issuecomment-330909067 https://github.com/w3c/csswg-drafts/issues/1693#issuecomment... * https://drafts.csswg.org/css-values/#calc-notation https://drafts.csswg.org/css-values/#calc-notation * https://www.w3.org/TR/css-round-display-1/#viewport-fit-descriptor https://www.w3.org/TR/css-round-display-1/#viewport-fit-desc... (Apple is doing the meta tag version of the @viewport descriptor)