[alwillis]

Apple is using W3C blessed standards:

* https://github.com/w3c/csswg-drafts/issues/1693#issuecomment...

* https://drafts.csswg.org/css-values/#calc-notation

* https://www.w3.org/TR/css-round-display-1/#viewport-fit-desc... (Apple is doing the meta tag version of the @viewport descriptor)

[bfred_it]

> Apple is doing the meta tag version of the @viewport descriptor

Which means they are in fact NOT using W3C blessed standards.