basic.css

:root {
	/* nested var */
	--prop-1: red;
	--prop-1: oklch(40% 0.234 0.39 / var(--opacity-50));

	/* multi-line */
	--prop-2: red;
	--prop-2: linear-gradient(
		45deg,
		rgba(255 255 255 / 0.15) 25%,
		transparent 25%,
		transparent 50%,
		rgba(255, 255, 255, 0.15) 45% 50%,
		color(rec2020 0.64331 0.19245 0.16771) 75%,
		transparent 75%,
		transparent
	);

	--prop-3: 1px;
	--prop-3: 2ic;
	--prop-4: 1px;
	--prop-4: 2ica;
	--prop-5: 1px;
	--prop-5: 2ic(1);

	/* interleaved */
	--gradient-prop-6: linear-gradient(90deg, black 25%, black 50%, blue 50%, blue 75%);
	--gradient-prop-7: conic-gradient(yellowgreen 40%, gold 0deg, gold 75%, #f06 0deg);
	--gradient-prop-6: linear-gradient(90deg, black 25% 50%, blue 50% 75%);
	--gradient-prop-7: conic-gradient(yellowgreen 40%, gold 0deg 75%, #f06 0deg);
	--gradient-prop-8: repeating-linear-gradient(90deg, black 25%, black 50%, blue 50%, blue 75%);
	--gradient-prop-9: repeating-conic-gradient(yellowgreen 40%, gold 0deg, gold 75%, #f06 0deg);
	--gradient-prop-8: repeating-linear-gradient(90deg, black 25% 50%, blue 50% 75%);
	--gradient-prop-9: repeating-conic-gradient(from 0deg, yellowgreen 40deg, gold 60deg 75deg, #f06 0deg);
	--gradient-prop-10: repeating-radial-gradient(red 0, red 8%, yellow 8%, yellow 16%, blue 16%, blue 24%);
	--gradient-prop-10: repeating-radial-gradient(red 0 8%, yellow 8% 16%, blue 16% 24%);

	/* multiple values space separated */
	--prop-8: 1px solid red;
	--prop-8: 1px solid oklch(40% 0.234 0.39 / var(--opacity-50));

	--prop-9: red;
	--prop-9: rgb(1,1,1,1);

	--prop-10: magenta;
	--prop-10: rgba(from magenta calc(r * 2) g b);
}

.initial {
	--prop-1: red;
	--prop-1: initial;
}

.white-space {
	--prop-1: red;
	--prop-1:;

	--prop-2: red;
	--prop-2: ;

	--prop-3: red;
	--prop-3:    ;
}

.not-root {
	--color-1: red;
	--color-1: color(srgb 0.64331 0.19245 0.16771);
}

:root {
	--color-1: red;
	--color-1: color(srgb 0.64331 0.19245 0.16771);

	--color-2: blue;
	--color-2: color(srgb 0.64331 0.19245 0.16771 / 50);

	--opacity-50: 0.5;
	--color-3: purple;
	--color-3: color(srgb 0.64331 0.19245 0.16771 / var(--opacity-50));

	--point-5: 0.5;
	--color-4: green;
	--color-4: color(srgb 0.64331 var(--point-5) 0.16771 / var(--opacity-50));

	--color-5: yellow;
	--color-5: color(srgb 0.64331   0.19245 0.16771 / calc(1 / 2));

	--color-6: orange;
	--color-6: color(rec2020 0.64331 0.19245 0.16771);

	--color-7: pink;
	--color-7: color(srgb 0.999 0.95 0.95);

	--color-8: pink;
	--color-8: color(display-p3 0.999 0.95 0.95);

	--color-9: pink;
	--color-9: color(rec2020 0.999 0.95 0.95);
}

:root {
		/* interleaved with color interpolation */
		--gradient-prop-6: linear-gradient(90deg, black 25%, black 50%, blue 50%, blue 75%);
		--gradient-prop-7: conic-gradient(yellowgreen 40%, gold 0deg, gold 75%, #f06 0deg);
		--gradient-prop-6: linear-gradient(in oklch 90deg, black 25% 50%, blue 50% 75%);
		--gradient-prop-7: conic-gradient(in oklch, yellowgreen 40%, gold 0deg 75%, #f06 0deg);
		--gradient-prop-8: repeating-linear-gradient(90deg, black 25%, black 50%, blue 50%, blue 75%);
		--gradient-prop-9: repeating-conic-gradient(yellowgreen 40%, gold 0deg, gold 75%, #f06 0deg);
		--gradient-prop-8: repeating-linear-gradient(in oklch 90deg, black 25% 50%, blue 50% 75%);
		--gradient-prop-9: repeating-conic-gradient(in oklch from 0deg, yellowgreen 40deg, gold 60deg 75deg, #f06 0deg);
		--gradient-prop-10: repeating-radial-gradient(red 0, red 8%, yellow 8%, yellow 16%, blue 16%, blue 24%);
		--gradient-prop-10: repeating-radial-gradient(in oklch, red 0 8%, yellow 8% 16%, blue 16% 24%);
}

:root {
	/* color-mix() */
	--color-mix-1: plum;
	--color-mix-1: color-mix(in lch, purple 50%, plum 50%);
	--color-mix-2: plum;
	--color-mix-2: color-mix(in lch longer, purple 50%, plum 50%);
	--color-mix-3: plum;
	--color-mix-3: color-mix(in lab, purple 50%, plum 50%);
	--color-mix-4: plum;
	--color-mix-4: color-mix(in srgb, purple, plum 50%);
	--color-mix-5: plum;
	--color-mix-5: color-mix(in srgb-linear, purple 50%, plum);
	--color-mix-6: plum;
	--color-mix-6: color-mix(in xyz, purple, plum);
	--color-mix-7: plum;
	--color-mix-7: color-mix(
		/* color space */
		in xyz,
		/* first color */
		purple,
		/* second color */
		plum
	);
}

:root {
	/* Not expected to be handled here at the moment, but might be needed in the future */
	--color-functional-notation-percentage-alpha: rgba(0, 0, 0, 1);
	--color-functional-notation-percentage-alpha: rgba(0, 0, 0, 100%);
}

:root {
	/* color-mix() */
	--color-mix-1: plum;
	--color-mix-1: color(display-p3 0.64331 0.19245 0.16771);
	--color-mix-1: color-mix(in lch, purple 50%, plum 50%);
	--color-mix-2: plum;
	--color-mix-2: color-mix(in lch longer, purple 50%, plum 50%);
	--color-mix-2: color(display-p3 0.64331 0.19245 0.16771);
}

:root {
	--color-rcs-1: green;
	--color-rcs-1: color(from color(a98-rgb 0.7 0.5 0.3) a98-rgb r g b / alpha);
	--color-rcs-2: green;
	--color-rcs-2: color(from color(a98-rgb 0.7 0.5 0.3) a98-rgb r g b / none);
	--color-rcs-3: green;
	--color-rcs-3: color(from color(prophoto-rgb 0.7 0.5 0.3) prophoto-rgb r g b);
	--color-rcs-4: green;
	--color-rcs-4: color(from color(prophoto-rgb 0.7 0.5 0.3) prophoto-rgb r g none);
	--color-rcs-5: green;
	--color-rcs-5: hwb(from hwb(50deg 20% 30%) h w b);
	--color-rcs-6: green;
	--color-rcs-6: lab(from lab(40% 56.6 39) l a b);
	--color-rcs-7: green;
	--color-rcs-7: lch(from lch(40% 56.6 39) l c h);
	--color-rcs-8: green;
	--color-rcs-8: oklab(from oklab(40% 0.566 0.39) l a b);
	--color-rcs-9: green;
	--color-rcs-9: oklch(from oklch(40% 0.566 39deg) l c h);
	--color-rcs-10: green;
	--color-rcs-10: rgb(from blue r g b);
	--color-rcs-11: green;
	--color-rcs-11: rgb(from blue r g b / alpha);
	--color-rcs-12: green;
	--color-rcs-12: hsl(from blue h s l / alpha);
}

:root {
	--color-rcs-invalid-1: green;
	--color-rcs-invalid-1: rgba(from blue r g b);
	--color-rcs-invalid-2: green;
	--color-rcs-invalid-2: hsla(from blue h s l);
	--color-rcs-invalid-3: green;
	--color-rcs-invalid-3: rgba(from blue r g b / alpha);
	--color-rcs-invalid-4: green;
	--color-rcs-invalid-4: hsla(from blue h s l / alpha);
	--color-rcs-invalid-5: green;
	--color-rcs-invalid-5: rgb(from blue r, g, b);
	--color-rcs-invalid-6: green;
	--color-rcs-invalid-6: hsl(from blue h, s, l);
	--color-rcs-invalid-7: green;
	--color-rcs-invalid-7: rgb(from blue r, g, b, alpha);
	--color-rcs-invalid-8: green;
	--color-rcs-invalid-8: hsl(from blue h, s, l, alpha);
}

.property-with-var--1 {
	--opacity: 1;
	color: rgba(87, 107, 149, 1);
	color: rgb(87 107 149 / var(--opacity));
}

.property-with-var--1-1 {
	--opacity: 1;
	color: rgba(87, 107, 149, var(--opacity));
	color: rgb(87 107 149 / var(--opacity));
}

.property-with-var--2 {
	--opacity: 1;
	color: rgba(87, 107, 149, 1);
	color: rgb(87 107 149 / calc(var(--opacity) / 2));
}

.property-with-var--3 {
	--length: 1px;
	top: 2px;
	top: var(--length);
}

.property-with-notvar--1 {
	--opacity: 1;
	color: rgba(87, 107, 149, 1);
	color: rgb(87 107 149 / notvar(--opacity));
}

/* CSS Nesting */
:root {
	@media screen {
		--prop-8: 1px solid red;
		--prop-8: 1px solid oklch(40% 0.234 0.39 / var(--opacity-50));
	}
}

:root {
	--color-light-dark-1: green;
	--color-light-dark-1: light-dark(green, blue);
}

:root {
	color: var(--green);
	color: light-dark(var(--green), blue);
}

:root {
	--color-contrast-color-1: green;
	--color-contrast-color-1: contrast-color(green);
}

:root {
	color: var(--green);
	color: contrast-color(var(--green));
}

.content-alt-text-a {
	content: "a";
	content: "a" / var(--foo);
}

.content-alt-text-b {
	content: "a" attr(href) "b";
	content: "a" attr(href) "b" / var(--foo) "c";
}

.content-alt-text-c {
	content: "a" "b";
	content: "a" "/" "b";
}

.content-alt-text-d {
	content: "a" "b";
	content: "a" / "b";
}