'rotate', 'scale' CSS properties incorrectly reported as 'doesn't exist'

[GitThingsDan]

I used the following websites to validate my URL:
https://jigsaw.w3.org/css-validator/
https://validator.w3.org/nu/

URL being validated or code to reproduce error:
https://gitthingsdan.github.io/CtrlAltIdol/css/style.css

In https://jigsaw.w3.org/css-validator/ :

Sorry! We found the following errors (21)

75	.body .mainBotonSidebar:hover	Property scale doesn't exist : 1.2
92	.body .mainSidebar-IndiceBox--Indice .nav-link:hover, .body .mainSidebar-IndiceBox--Indice .nav-link.active	Property scale doesn't exist : 1.05
188	.headerNavbar-TituloPrincipal--Titulo:hover	Property scale doesn't exist : 1.025
191	.headerNavbar-TituloPrincipal--Titulo:active	Property scale doesn't exist : 0.975
281	.headerNavbar-List .nav-item:active	Property scale doesn't exist : 0.9
308	.headerNavbar-List .nav-item:active	Property scale doesn't exist : 0.9
338	.footerNavzone-Boxes--ImgLinks:hover	Property scale doesn't exist : 1.025
341	.footerNavzone-Boxes--ImgLinks:active	Property scale doesn't exist : 0.975
363	.footerNavzone-Boxes--TxtLinks:hover	Property scale doesn't exist : 1.05
366	.footerNavzone-Boxes--TxtLinks:active	Property scale doesn't exist : 0.95
455	.footerDatosPersonales-IconosSociales--Links---Logos:hover	Property scale doesn't exist : 1.1
458	.footerDatosPersonales-IconosSociales--Links---Logos:active	Property scale doesn't exist : 0.95
479	.footer #goToTopBox:hover	Property scale doesn't exist : 1.25
486		Property rotate doesn't exist : y 0deg
489		Property rotate doesn't exist : y 180deg
795	.portadaBis .carousel-control-icons:hover, .portadaBis .carousel-control-next-icon:hover, .portadaBis .carousel-control-prev-icon:hover	Property scale doesn't exist : 1.5
798	.portadaBis .carousel-control-prev-icon	Property rotate doesn't exist : -90deg
801	.portadaBis .carousel-control-next-icon	Property rotate doesn't exist : 90deg
812	.portadaBis .carousel-indicators button:hover, .portadaBis .carousel-indicators button.active	Property scale doesn't exist : 1 2
1058	.mainQuiz-Form #submitBox-Button:hover	Property scale doesn't exist : 1.05
1061	.mainQuiz-Form #submitBox-Button:active	Property scale doesn't exist : 0.95

[estelle]

I came here to file a similar issue; the individual transform functions, ie scale and translate, are not supported by the validator.

[wdburgdorf]

Also contain-intrinsic-size is not supported, and color-mix, and this doesn't validate either:
background-color: var(--mycolor)

Since this issue has already been open for over a year and still "new", is there hope it will get updated anytime soon, or at all?

[lukejans]

I came here for the same issue. When using the this css property, rotate: <deg>;, the following error is printed:

CSS: "rotate": Property "rotate" doesn't exist.