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color-valid-relative-color.html
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color-valid-relative-color.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Color Level 5: Parsing and serialization of colors using valid relative color syntax</title>
<link rel="author" title="Sam Weinig" href="mailto:weinig@apple.com">
<link rel="help" href="https://drafts.csswg.org/css-color-5/#relative-colors">
<link rel="help" href="https://drafts.csswg.org/css-color-5/#serial-relative-color">
<meta name="assert" content="colors using relative color syntax parse and serialize as expected">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script src="/css/support/color-testcommon.js"></script>
<style>
html {
--bg-color: blue;
--color: green;
--accent: lightseagreen;
--mycolor: orchid;
--mygray: lch(from var(--mycolor) l 0 h);
}
</style>
</head>
<body>
<script>
// rgb(from ...)
for (const rgbFunction of ["rgb", "rgba"]) {
// Testing no modifications.
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r g b)`, `color(srgb 0.4 0.2 0.6)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r g b / alpha)`, `color(srgb 0.4 0.2 0.6)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) r g b / alpha)`, `color(srgb 0.2 0.4 0.6 / 0.8)`);
fuzzy_test_valid_color(`${rgbFunction}(from hsl(120deg 20% 50% / .5) r g b / alpha)`, `color(srgb 0.4 0.6 0.4 / 0.5)`);
// Test nesting relative colors.
fuzzy_test_valid_color(`${rgbFunction}(from rgb(from rebeccapurple r g b) r g b)`, `color(srgb 0.4 0.2 0.6)`);
// Testing replacement with 0.
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple 0 0 0)`, `color(srgb 0 0 0)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple 0 0 0 / 0)`, `color(srgb 0 0 0 / 0)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple 0 g b / alpha)`, `color(srgb 0 0.2 0.6)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r 0 b / alpha)`, `color(srgb 0.4 0 0.6)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r g 0 / alpha)`, `color(srgb 0.4 0.2 0)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r g b / 0)`, `color(srgb 0.4 0.2 0.6 / 0)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) 0 g b / alpha)`, `color(srgb 0 0.4 0.6 / 0.8)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) r 0 b / alpha)`, `color(srgb 0.2 0 0.6 / 0.8)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) r g 0 / alpha)`, `color(srgb 0.2 0.4 0 / 0.8)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) r g b / 0)`, `color(srgb 0.2 0.4 0.6 / 0)`);
// Testing replacement with a number.
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple 25 g b / alpha)`, `color(srgb 0.098 0.2 0.6)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r 25 b / alpha)`, `color(srgb 0.4 0.098 0.6)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r g 25 / alpha)`, `color(srgb 0.4 0.2 0.098)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r g b / .25)`, `color(srgb 0.4 0.2 0.6 / 0.25)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) 25 g b / alpha)`, `color(srgb 0.098 0.4 0.6 / 0.8)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) r 25 b / alpha)`, `color(srgb 0.2 0.098 0.6 / 0.8)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) r g 25 / alpha)`, `color(srgb 0.2 0.4 0.098 / 0.8)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) r g b / .20)`, `color(srgb 0.2 0.4 0.6 / 0.2)`);
// Testing replacement with a percentage.
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple 20% g b / alpha)`, `color(srgb 0.2 0.2 0.6)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r 20% b / alpha)`, `color(srgb 0.4 0.2 0.6)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r g 20% / alpha)`, `color(srgb 0.4 0.2 0.2)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r g b / 20%)`, `color(srgb 0.4 0.2 0.6 / 0.2)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) 20% g b / alpha)`, `color(srgb 0.2 0.4 0.6 / 0.8)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) r 20% b / alpha)`, `color(srgb 0.2 0.2 0.6 / 0.8)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) r g 20% / alpha)`, `color(srgb 0.2 0.4 0.2 / 0.8)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) r g b / 20%)`, `color(srgb 0.2 0.4 0.6 / 0.2)`);
// Testing replacement with a number for r, g, b but percent for alpha.
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple 25 g b / 25%)`, `color(srgb 0.098 0.2 0.6 / 0.25)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r 25 b / 25%)`, `color(srgb 0.4 0.098 0.6 / 0.25)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r g 25 / 25%)`, `color(srgb 0.4 0.2 0.098 / 0.25)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) 25 g b / 25%)`, `color(srgb 0.098 0.4 0.6 / 0.25)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) r 25 b / 25%)`, `color(srgb 0.2 0.098 0.6 / 0.25)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) r g 25 / 25%)`, `color(srgb 0.2 0.4 0.098 / 0.25)`);
// Testing permutation.
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple g b r)`, `color(srgb 0.2 0.6 0.4)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple b alpha r / g)`, `color(srgb 0.6 0.004 0.4)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r r r / r)`, `color(srgb 0.4 0.4 0.4)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple alpha alpha alpha / alpha)`, `color(srgb 0.004 0.004 0.004)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) g b r)`, `color(srgb 0.4 0.6 0.2 / 0.8)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) b alpha r / g)`, `color(srgb 0.6 0.003 0.2)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) r r r / r)`, `color(srgb 0.2 0.2 0.2)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) alpha alpha alpha / alpha)`, `color(srgb 0.003 0.003 0.003 / 0.8)`);
// Testing mixes of number and percentage. (These would not be allowed in the non-relative syntax).
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r 20% 10)`, `color(srgb 0.4 0.2 0.0392)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r 10 20%)`, `color(srgb 0.4 0.0392 0.2)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple 0% 10 10)`, `color(srgb 0 0.0392 0.0392)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) r 20% 10)`, `color(srgb 0.2 0.2 0.0392 / 0.8)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) r 10 20%)`, `color(srgb 0.2 0.0392 0.2 / 0.8)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) 0% 10 10)`, `color(srgb 0 0.0392 0.0392 / 0.8)`);
// r g b
// 102 51 153
// 40% 20% 60%
// Testing with calc().
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple calc(r) calc(g) calc(b))`, `color(srgb 0.4 0.2 0.6)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r calc(g * 2) 10)`, `color(srgb 0.4 0.4 0.0392)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple b calc(r * .5) 10)`, `color(srgb 0.6 0.2 0.0392)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r calc(g * .5 + g * .5) 10)`, `color(srgb 0.4 0.2 0.0392)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r calc(b * .5 - g * .5) 10)`, `color(srgb 0.4 0.2 0.0392)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20%, 40%, 60%, 80%) calc(r) calc(g) calc(b) / calc(alpha))`, `color(srgb 0.2 0.4 0.6 / 0.8)`);
// Testing with 'none'.
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple none none none)`, `color(srgb none none none)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple none none none / none)`, `color(srgb none none none / none)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r g none)`, `color(srgb 0.4 0.2 none)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r g none / alpha)`, `color(srgb 0.4 0.2 none)`);
fuzzy_test_valid_color(`${rgbFunction}(from rebeccapurple r g b / none)`, `color(srgb 0.4 0.2 0.6 / none)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20% 40% 60% / 80%) r g none / alpha)`, `color(srgb 0.2 0.4 none / 0.8)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20% 40% 60% / 80%) r g b / none)`, `color(srgb 0.2 0.4 0.6 / none)`);
// FIXME: Clarify with spec editors if 'none' should pass through to the constants.
fuzzy_test_valid_color(`${rgbFunction}(from rgb(none none none) r g b)`, `color(srgb 0 0 0)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(none none none / none) r g b / alpha)`, `color(srgb 0 0 0 / 0)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20% none 60%) r g b)`, `color(srgb 0.2 0 0.6)`);
fuzzy_test_valid_color(`${rgbFunction}(from rgb(20% 40% 60% / none) r g b / alpha)`, `color(srgb 0.2 0.4 0.6 / 0)`);
// Testing with 'currentColor'
fuzzy_test_valid_color(`${rgbFunction}(from currentColor r g b)`, `rgb(from currentColor r g b)`);
// color-mix
fuzzy_test_valid_color(`${rgbFunction}(from color-mix(in srgb, red, red) r g b / alpha)`, `color(srgb 1 0 0)`);
}
// hsl(from ...)
for (const hslFunction of ["hsl", "hsla"]) {
// Testing no modifications.
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple h s l)`, `color(srgb 0.4 0.2 0.6)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple h s l / alpha)`, `color(srgb 0.4 0.2 0.6)`);
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) h s l / alpha)`, `color(srgb 0.2 0.4 0.6 / 0.8)`);
fuzzy_test_valid_color(`${hslFunction}(from hsl(120deg 20% 50% / .5) h s l / alpha)`, `color(srgb 0.4 0.6 0.4 / 0.5)`);
// Test nesting relative colors.
fuzzy_test_valid_color(`${hslFunction}(from hsl(from rebeccapurple h s l) h s l)`, `color(srgb 0.4 0.2 0.6)`);
// Testing replacement with 0.
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple 0 0% 0%)`, `color(srgb 0 0 0)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple 0deg 0% 0%)`, `color(srgb 0 0 0)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple 0 0% 0% / 0)`, `color(srgb 0 0 0 / 0)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple 0deg 0% 0% / 0)`, `color(srgb 0 0 0 / 0)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple 0 s l / alpha)`, `color(srgb 0.6 0.2 0.2)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple 0deg s l / alpha)`, `color(srgb 0.6 0.2 0.2)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple h 0% l / alpha)`, `color(srgb 0.4 0.4 0.4)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple h s 0% / alpha)`, `color(srgb 0 0 0)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple h s l / 0)`, `color(srgb 0.4 0.2 0.6 / 0)`);
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) 0 s l / alpha)`, `color(srgb 0.6 0.2 0.2 / 0.8)`);
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) 0deg s l / alpha)`, `color(srgb 0.6 0.2 0.2 / 0.8)`);
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) h 0% l / alpha)`, `color(srgb 0.4 0.4 0.4 / 0.8)`);
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) h s 0% / alpha)`, `color(srgb 0 0 0 / 0.8)`);
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) h s l / 0)`, `color(srgb 0.2 0.4 0.6 / 0)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple 25 s l / alpha)`, `color(srgb 0.6 0.3667 0.2)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple 25deg s l / alpha)`, `color(srgb 0.6 0.3667 0.2)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple h 20% l / alpha)`, `color(srgb 0.4 0.32 0.48)`);
// hsl(from rebeccapurple h s 20% / alpha) is equivalent to color(srgb 0.2 0.1 0.3).
// For the green channel: 0.1 * 255 = 25.5. This should get rounded towards infinity to 26.
// https://www.w3.org/TR/css-color-4/#rgb-functions
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple h s 20% / alpha)`, `color(srgb 0.2 0.1 0.3)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple h s l / .25)`, `color(srgb 0.4 0.2 0.6 / 0.25)`);
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) 25 s l / alpha)`, `color(srgb 0.6 0.3667 0.2 / 0.8)`);
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) 25deg s l / alpha)`, `color(srgb 0.6 0.3667 0.2 / 0.8)`);
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) h 20% l / alpha)`, `color(srgb 0.32 0.4 0.48 / 0.8)`);
// hsl(from rgb(20%, 40%, 60%, 80%) h s 20% / alpha) is equivalent to color(srgb 0.1 0.2 0.3).
// For the red channel: 0.1 * 255 = 25.5. This should get rounded towards infinity to 26.
// https://www.w3.org/TR/css-color-4/#rgb-functions
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) h s 20% / alpha)`, `color(srgb 0.1 0.2 0.3 / 0.8)`);
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) h s l / .2)`, `color(srgb 0.2 0.4 0.6 / 0.2)`);
// Testing valid permutation (types match).
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple h l s)`, `color(srgb 0.5 0.3 0.7)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple h alpha l / s)`, `color(srgb 0.4 0.396 0.404)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple h l l / l)`, `color(srgb 0.4 0.24 0.56)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple h alpha alpha / alpha)`, `color(srgb 0.01 0.01 0.01)`);
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) h l s)`, `color(srgb 0.3 0.5 0.7 / 0.8)`);
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) h alpha l / s)`, `color(srgb 0.4 0.4 0.4)`);
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) h l l / l)`, `color(srgb 0.24 0.4 0.56)`);
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) h alpha alpha / alpha)`, `color(srgb 0.01 0.01 0.01 / 0.8)`);
// Testing with calc().
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple calc(h) calc(s) calc(l))`, `color(srgb 0.4 0.2 0.6)`);
fuzzy_test_valid_color(`${hslFunction}(from rgb(20%, 40%, 60%, 80%) calc(h) calc(s) calc(l) / calc(alpha))`, `color(srgb 0.2 0.4 0.6 / 0.8)`);
// Testing with 'none'.
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple none none none)`, `color(srgb 0 0 0)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple none none none / none)`, `color(srgb 0 0 0 / 0)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple h s none)`, `color(srgb 0 0 0)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple h s none / alpha)`, `color(srgb 0 0 0)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple h s l / none)`, `color(srgb 0.4 0.2 0.6 / none)`);
fuzzy_test_valid_color(`${hslFunction}(from rebeccapurple none s l / alpha)`, `color(srgb 0.6 0.2 0.2)`);
fuzzy_test_valid_color(`${hslFunction}(from hsl(120deg 20% 50% / .5) h s none / alpha)`, `color(srgb 0 0 0 / 0.5)`);
fuzzy_test_valid_color(`${hslFunction}(from hsl(120deg 20% 50% / .5) h s l / none)`, `color(srgb 0.4 0.6 0.4 / none)`);
fuzzy_test_valid_color(`${hslFunction}(from hsl(120deg 20% 50% / .5) none s l / alpha)`, `color(srgb 0.6 0.4 0.4 / 0.5)`);
// FIXME: Clarify with spec editors if 'none' should pass through to the constants.
fuzzy_test_valid_color(`${hslFunction}(from hsl(none none none) h s l)`, `color(srgb 0 0 0)`);
fuzzy_test_valid_color(`${hslFunction}(from hsl(none none none / none) h s l / alpha)`, `color(srgb 0 0 0 / 0)`);
fuzzy_test_valid_color(`${hslFunction}(from hsl(120deg none 50% / .5) h s l)`, `color(srgb 0.5 0.5 0.5 / 0.5)`);
fuzzy_test_valid_color(`${hslFunction}(from hsl(120deg 20% 50% / none) h s l / alpha)`, `color(srgb 0.4 0.6 0.4 / 0)`);
fuzzy_test_valid_color(`${hslFunction}(from hsl(none 20% 50% / .5) h s l / alpha)`, `color(srgb 0.6 0.4 0.4 / 0.5)`);
// Testing with 'currentColor'
fuzzy_test_valid_color(`${hslFunction}(from currentColor h s l)`, `hsl(from currentColor h s l)`);
// color-mix
fuzzy_test_valid_color(`${hslFunction}(from color-mix(in srgb, red, red) h s l / alpha)`, `color(srgb 1 0 0)`);
}
// hwb(from ...)
// Testing no modifications.
fuzzy_test_valid_color(`hwb(from rebeccapurple h w b)`, `color(srgb 0.4 0.2 0.6)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple h w b / alpha)`, `color(srgb 0.4 0.2 0.6)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) h w b / alpha)`, `color(srgb 0.2 0.4 0.6 / 0.8)`);
fuzzy_test_valid_color(`hwb(from hsl(120deg 20% 50% / .5) h w b / alpha)`, `color(srgb 0.4 0.6 0.4 / 0.5)`);
// Test nesting relative colors.
fuzzy_test_valid_color(`hwb(from hwb(from rebeccapurple h w b) h w b)`, `color(srgb 0.4 0.2 0.6)`);
// Testing replacement with 0.
fuzzy_test_valid_color(`hwb(from rebeccapurple 0 0% 0%)`, `color(srgb 1 0 0)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple 0deg 0% 0%)`, `color(srgb 1 0 0)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple 0 0% 0% / 0)`, `color(srgb 1 0 0 / 0)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple 0deg 0% 0% / 0)`, `color(srgb 1 0 0 / 0)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple 0 w b / alpha)`, `color(srgb 0.6 0.2 0.2)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple 0deg w b / alpha)`, `color(srgb 0.6 0.2 0.2)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple h 0% b / alpha)`, `color(srgb 0.3 0 0.6)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple h w 0% / alpha)`, `color(srgb 0.6 0.2 1)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple h w b / 0)`, `color(srgb 0.4 0.2 0.6 / 0)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) 0 w b / alpha)`, `color(srgb 0.6 0.2 0.2 / 0.8)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) 0deg w b / alpha)`, `color(srgb 0.6 0.2 0.2 / 0.8)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) h 0% b / alpha)`, `color(srgb 0 0.3 0.6 / 0.8)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) h w 0% / alpha)`, `color(srgb 0.2 0.6 1 / 0.8)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) h w b / 0)`, `color(srgb 0.2 0.4 0.6 / 0)`);
// Testing replacement with a constant.
fuzzy_test_valid_color(`hwb(from rebeccapurple 25 w b / alpha)`, `color(srgb 0.6 0.3667 0.2)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple 25deg w b / alpha)`, `color(srgb 0.6 0.3667 0.2)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple h 20% b / alpha)`, `color(srgb 0.4 0.2 0.6)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple h w 20% / alpha)`, `color(srgb 0.5 0.2 0.8)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple h w b / .2)`, `color(srgb 0.4 0.2 0.6 / 0.2)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) 25 w b / alpha)`, `color(srgb 0.6 0.3667 0.2 / 0.8)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) 25deg w b / alpha)`, `color(srgb 0.6 0.3667 0.2 / 0.8)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) h 20% b / alpha)`, `color(srgb 0.2 0.4 0.6 / 0.8)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) h w 20% / alpha)`, `color(srgb 0.2 0.5 0.8 / 0.8)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) h w b / .2)`, `color(srgb 0.2 0.4 0.6 / 0.2)`);
// Testing valid permutation (types match).
fuzzy_test_valid_color(`hwb(from rebeccapurple h b w)`, `color(srgb 0.6 0.4 0.8)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple h alpha w / b)`, `color(srgb 0.405 0.01 0.8)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple h w w / w)`, `color(srgb 0.5 0.2 0.8)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple h alpha alpha / alpha)`, `color(srgb 0.5 0.01 0.99)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) h b w)`, `color(srgb 0.4 0.6 0.8 / 0.8)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) h alpha w / b)`, `color(srgb 0.01 0.404 0.8)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) h w w / w)`, `color(srgb 0.2 0.5 0.8)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) h alpha alpha / alpha)`, `color(srgb 0.01 0.5 0.99 / 0.8)`);
// Testing with calc().
fuzzy_test_valid_color(`hwb(from rebeccapurple calc(h) calc(w) calc(b))`, `color(srgb 0.4 0.2 0.6)`);
fuzzy_test_valid_color(`hwb(from rgb(20%, 40%, 60%, 80%) calc(h) calc(w) calc(b) / calc(alpha))`, `color(srgb 0.2 0.4 0.6 / 0.8)`);
// Testing with 'none'.
fuzzy_test_valid_color(`hwb(from rebeccapurple none none none)`, `color(srgb 1 0 0)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple none none none / none)`, `color(srgb 1 0 0 / none)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple h w none)`, `color(srgb 0.6 0.2 1)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple h w none / alpha)`, `color(srgb 0.6 0.2 1)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple h w b / none)`, `color(srgb 0.4 0.2 0.6 / none)`);
fuzzy_test_valid_color(`hwb(from rebeccapurple none w b / alpha)`, `color(srgb 0.6 0.2 0.2)`);
fuzzy_test_valid_color(`hwb(from hwb(120deg 20% 50% / .5) h w none / alpha)`, `color(srgb 0.2 1 0.2 / 0.5)`);
fuzzy_test_valid_color(`hwb(from hwb(120deg 20% 50% / .5) h w b / none)`, `color(srgb 0.2 0.5 0.2 / none)`);
fuzzy_test_valid_color(`hwb(from hwb(120deg 20% 50% / .5) none w b / alpha)`, `color(srgb 0.5 0.2 0.2 / 0.5)`);
// FIXME: Clarify with spec editors if 'none' should pass through to the constants.
fuzzy_test_valid_color(`hwb(from hwb(none none none) h w b)`, `color(srgb 1 0 0)`);
fuzzy_test_valid_color(`hwb(from hwb(none none none / none) h w b / alpha)`, `color(srgb 1 0 0 / 0)`);
fuzzy_test_valid_color(`hwb(from hwb(120deg none 50% / .5) h w b)`, `color(srgb 0 0.5 0 / 0.5)`);
fuzzy_test_valid_color(`hwb(from hwb(120deg 20% 50% / none) h w b / alpha)`, `color(srgb 0.2 0.5 0.2 / 0)`);
fuzzy_test_valid_color(`hwb(from hwb(none 20% 50% / .5) h w b / alpha)`, `color(srgb 0.5 0.2 0.2 / 0.5)`);
// Testing with 'currentColor'
fuzzy_test_valid_color(`hwb(from currentColor h w b)`, `hwb(from currentColor h w b)`);
// color-mix
fuzzy_test_valid_color(`hwb(from color-mix(in srgb, red, red) h w b / alpha)`, `color(srgb 1 0 0)`);
// lab()
// Testing no modifications.
fuzzy_test_valid_color(`lab(from lab(25 20 50) l a b)`, `lab(25 20 50)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50) l a b / alpha)`, `lab(25 20 50)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50 / 40%) l a b / alpha)`, `lab(25 20 50 / 0.4)`);
fuzzy_test_valid_color(`lab(from lab(200 300 400 / 500%) l a b / alpha)`, `lab(100 300 400)`);
fuzzy_test_valid_color(`lab(from lab(-200 -300 -400 / -500%) l a b / alpha)`, `lab(0 -300 -400 / 0)`);
// Test nesting relative colors.
fuzzy_test_valid_color(`lab(from lab(from lab(25 20 50) l a b) l a b)`, `lab(25 20 50)`);
// Testing non-lab origin to see conversion.
fuzzy_test_valid_color(`lab(from color(display-p3 0 0 0) l a b / alpha)`, `lab(0 0 0)`);
// Testing replacement with 0.
fuzzy_test_valid_color(`lab(from lab(25 20 50) 0 0 0)`, `lab(0 0 0)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50) 0 0 0 / 0)`, `lab(0 0 0 / 0)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50) 0 a b / alpha)`, `lab(0 20 50)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50) l 0 b / alpha)`, `lab(25 0 50)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50) l a 0 / alpha)`, `lab(25 20 0)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50) l a b / 0)`, `lab(25 20 50 / 0)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50 / 40%) 0 a b / alpha)`, `lab(0 20 50 / 0.4)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50 / 40%) l 0 b / alpha)`, `lab(25 0 50 / 0.4)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50 / 40%) l a 0 / alpha)`, `lab(25 20 0 / 0.4)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50 / 40%) l a b / 0)`, `lab(25 20 50 / 0)`);
// Testing replacement with a constant.
fuzzy_test_valid_color(`lab(from lab(25 20 50) 35 a b / alpha)`, `lab(35 20 50)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50) l 35 b / alpha)`, `lab(25 35 50)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50) l a 35 / alpha)`, `lab(25 20 35)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50) l a b / .35)`, `lab(25 20 50 / 0.35)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50 / 40%) 35 a b / alpha)`, `lab(35 20 50 / 0.4)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50 / 40%) l 35 b / alpha)`, `lab(25 35 50 / 0.4)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50 / 40%) l a 35 / alpha)`, `lab(25 20 35 / 0.4)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50 / 40%) l a b / .35)`, `lab(25 20 50 / 0.35)`);
fuzzy_test_valid_color(`lab(from lab(0.7 45 30 / 40%) 200 300 400 / 500)`, `lab(100 300 400)`);
fuzzy_test_valid_color(`lab(from lab(0.7 45 30 / 40%) -200 -300 -400 / -500)`, `lab(0 -300 -400 / 0)`);
// Testing valid permutation (types match).
fuzzy_test_valid_color(`lab(from lab(25 20 50) l b a)`, `lab(25 50 20)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50) l a a / a)`, `lab(25 20 20)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50 / 40%) l b a)`, `lab(25 50 20 / 0.4)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50 / 40%) l a a / a)`, `lab(25 20 20)`);
// Testing with calc().
fuzzy_test_valid_color(`lab(from lab(25 20 50) calc(l) calc(a) calc(b))`, `lab(25 20 50)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50 / 40%) calc(l) calc(a) calc(b) / calc(alpha))`, `lab(25 20 50 / 0.4)`);
fuzzy_test_valid_color(`lab(from lab(50 -30 40) calc(l - 20) a b)`, `lab(30 -30 40)`);
fuzzy_test_valid_color(`lab(from lab(50 -30 40) l calc(a / 3) calc(b / 2))`, `lab(50 -10 20)`);
// Testing with 'none'.
fuzzy_test_valid_color(`lab(from lab(25 20 50) none none none)`, `lab(none none none)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50) none none none / none)`, `lab(none none none / none)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50) l a none)`, `lab(25 20 none)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50) l a none / alpha)`, `lab(25 20 none)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50) l a b / none)`, `lab(25 20 50 / none)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50 / 40%) l a none / alpha)`, `lab(25 20 none / 0.4)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50 / 40%) l a b / none)`, `lab(25 20 50 / none)`);
// FIXME: Clarify with spec editors if 'none' should pass through to the constants.
fuzzy_test_valid_color(`lab(from lab(none none none) l a b)`, `lab(0 0 0)`);
fuzzy_test_valid_color(`lab(from lab(none none none / none) l a b / alpha)`, `lab(0 0 0 / 0)`);
fuzzy_test_valid_color(`lab(from lab(25 none 50) l a b)`, `lab(25 0 50)`);
fuzzy_test_valid_color(`lab(from lab(25 20 50 / none) l a b / alpha)`, `lab(25 20 50 / 0)`);
// Testing with 'currentColor'
fuzzy_test_valid_color(`lab(from currentColor l a b)`, `lab(from currentColor l a b)`);
// color-mix
fuzzy_test_valid_color(`lab(from color-mix(in lab, lab(25 20 50), lab(25 20 50)) l a b / alpha)`, `lab(25 20 50)`);
// oklab()
// Testing no modifications.
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) l a b)`, `oklab(0.25 0.2 0.5)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) l a b / alpha)`, `oklab(0.25 0.2 0.5)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5 / 40%) l a b / alpha)`, `oklab(0.25 0.2 0.5 / 0.4)`);
fuzzy_test_valid_color(`oklab(from oklab(2 3 4 / 500%) l a b / alpha)`, `oklab(1 3 4)`);
fuzzy_test_valid_color(`oklab(from oklab(-2 -3 -4 / -500%) l a b / alpha)`, `oklab(0 -3 -4 / 0)`);
// Test nesting relative colors.
fuzzy_test_valid_color(`oklab(from oklab(from oklab(0.25 0.2 0.5) l a b) l a b)`, `oklab(0.25 0.2 0.5)`);
// Testing non-oklab origin to see conversion.
fuzzy_test_valid_color(`oklab(from color(display-p3 0 0 0) l a b / alpha)`, `oklab(0 0 0)`);
// Testing replacement with 0.
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) 0 0 0)`, `oklab(0 0 0)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) 0 0 0 / 0)`, `oklab(0 0 0 / 0)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) 0 a b / alpha)`, `oklab(0 0.2 0.5)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) l 0 b / alpha)`, `oklab(0.25 0 0.5)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) l a 0 / alpha)`, `oklab(0.25 0.2 0)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) l a b / 0)`, `oklab(0.25 0.2 0.5 / 0)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5 / 40%) 0 a b / alpha)`, `oklab(0 0.2 0.5 / 0.4)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5 / 40%) l 0 b / alpha)`, `oklab(0.25 0 0.5 / 0.4)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5 / 40%) l a 0 / alpha)`, `oklab(0.25 0.2 0 / 0.4)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5 / 40%) l a b / 0)`, `oklab(0.25 0.2 0.5 / 0)`);
// Testing replacement with a constant.
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) 0.35 a b / alpha)`, `oklab(0.35 0.2 0.5)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) l 0.35 b / alpha)`, `oklab(0.25 0.35 0.5)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) l a 0.35 / alpha)`, `oklab(0.25 0.2 0.35)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) l a b / .35)`, `oklab(0.25 0.2 0.5 / 0.35)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5 / 40%) 0.35 a b / alpha)`, `oklab(0.35 0.2 0.5 / 0.4)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5 / 40%) l 0.35 b / alpha)`, `oklab(0.25 0.35 0.5 / 0.4)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5 / 40%) l a 0.35 / alpha)`, `oklab(0.25 0.2 0.35 / 0.4)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5 / 40%) l a b / .35)`, `oklab(0.25 0.2 0.5 / 0.35)`);
fuzzy_test_valid_color(`oklab(from oklab(0.7 0.45 0.3 / 40%) 2 3 4 / 500)`, `oklab(1 3 4)`);
fuzzy_test_valid_color(`oklab(from oklab(0.7 0.45 0.3 / 40%) -2 -3 -4 / -500)`, `oklab(0 -3 -4 / 0)`);
// Testing valid permutation (types match).
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) l b a)`, `oklab(0.25 0.5 0.2)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) l a a / a)`, `oklab(0.25 0.2 0.2 / 0.2)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5 / 40%) l b a)`, `oklab(0.25 0.5 0.2 / 0.4)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5 / 40%) l a a / a)`, `oklab(0.25 0.2 0.2 / 0.2)`);
// Testing with calc().
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) calc(l) calc(a) calc(b))`, `oklab(0.25 0.2 0.5)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5 / 40%) calc(l) calc(a) calc(b) / calc(alpha))`, `oklab(0.25 0.2 0.5 / 0.4)`);
fuzzy_test_valid_color(`oklab(from oklab(0.7 0.25 -0.15) calc(l - 0.2) a b)`, `oklab(0.5 0.25 -0.15)`);
fuzzy_test_valid_color(`oklab(from oklab(0.7 0.25 -0.15) l calc(a / 2) calc(b / 3))`, `oklab(0.7 0.125 -0.05)`);
// Testing with 'none'.
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) none none none)`, `oklab(none none none)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) none none none / none)`, `oklab(none none none / none)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) l a none)`, `oklab(0.25 0.2 none)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) l a none / alpha)`, `oklab(0.25 0.2 none)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5) l a b / none)`, `oklab(0.25 0.2 0.5 / none)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5 / 40%) l a none / alpha)`, `oklab(0.25 0.2 none / 0.4)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5 / 40%) l a b / none)`, `oklab(0.25 0.2 0.5 / none)`);
// FIXME: Clarify with spec editors if 'none' should pass through to the constants.
fuzzy_test_valid_color(`oklab(from oklab(none none none) l a b)`, `oklab(0 0 0)`);
fuzzy_test_valid_color(`oklab(from oklab(none none none / none) l a b / alpha)`, `oklab(0 0 0 / 0)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 none 0.5) l a b)`, `oklab(0.25 0 0.5)`);
fuzzy_test_valid_color(`oklab(from oklab(0.25 0.2 0.5 / none) l a b / alpha)`, `oklab(0.25 0.2 0.5 / 0)`);
// Testing with 'currentColor'
fuzzy_test_valid_color(`oklab(from currentColor l a b)`, `oklab(from currentColor l a b)`);
// color-mix
fuzzy_test_valid_color(`oklab(from color-mix(in oklab, oklab(0.25 0.2 0.5), oklab(0.25 0.2 0.5)) l a b / alpha)`, `oklab(0.25 0.2 0.5)`);
// lch()
// Testing no modifications.
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) l c h)`, `lch(0.7 45 30)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) l c h / alpha)`, `lch(0.7 45 30)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) l c h / alpha)`, `lch(0.7 45 30 / 0.4)`);
fuzzy_test_valid_color(`lch(from lch(200 300 400 / 500%) l c h / alpha)`, `lch(100 300 40)`);
fuzzy_test_valid_color(`lch(from lch(-200 -300 -400 / -500%) l c h / alpha)`, `lch(0 0 320 / 0)`);
// Test nesting relative colors.
fuzzy_test_valid_color(`lch(from lch(from lch(0.7 45 30) l c h) l c h)`, `lch(0.7 45 30)`);
// Testing non-sRGB origin colors (no gamut mapping will happen since the destination is not a bounded RGB color space).
fuzzy_test_valid_color(`lch(from color(display-p3 0 0 0) l c h / alpha)`, `lch(0 0 0)`);
fuzzy_test_valid_color(`lch(from lab(0.7 45 30) l c h / alpha)`, `lch(0.7 54.08327 33.690067)`);
// Testing replacement with 0.
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) 0 0 0)`, `lch(0 0 0)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) 0 0 0deg)`, `lch(0 0 0)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) 0 0 0 / 0)`, `lch(0 0 0 / 0)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) 0 0 0deg / 0)`, `lch(0 0 0 / 0)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) 0 c h / alpha)`, `lch(0 45 30)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) l 0 h / alpha)`, `lch(0.7 0 30)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) l c 0 / alpha)`, `lch(0.7 45 0)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) l c 0deg / alpha)`, `lch(0.7 45 0)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) l c h / 0)`, `lch(0.7 45 30 / 0)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) 0 c h / alpha)`, `lch(0 45 30 / 0.4)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) l 0 h / alpha)`, `lch(0.7 0 30 / 0.4)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) l c 0 / alpha)`, `lch(0.7 45 0 / 0.4)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) l c 0deg / alpha)`, `lch(0.7 45 0 / 0.4)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) l c h / 0)`, `lch(0.7 45 30 / 0)`);
// Testing replacement with a constant.
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) 25 c h / alpha)`, `lch(25 45 30)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) l 25 h / alpha)`, `lch(0.7 25 30)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) l c 25 / alpha)`, `lch(0.7 45 25)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) l c 25deg / alpha)`, `lch(0.7 45 25)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) l c h / .25)`, `lch(0.7 45 30 / 0.25)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) 25 c h / alpha)`, `lch(25 45 30 / 0.4)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) l 25 h / alpha)`, `lch(0.7 25 30 / 0.4)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) l c 25 / alpha)`, `lch(0.7 45 25 / 0.4)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) l c 25deg / alpha)`, `lch(0.7 45 25 / 0.4)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) l c h / .25)`, `lch(0.7 45 30 / 0.25)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) 200 300 400 / 500)`, `lch(100 300 40)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) -200 -300 -400 / -500)`, `lch(0 0 320 / 0)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) 50 120 400deg / 500)`, `lch(50 120 40)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) 50 120 -400deg / -500)`, `lch(50 120 320 / 0)`);
// Testing valid permutation (types match).
// NOTE: 'c' is a vaild hue, as hue is <angle>|<number>.
fuzzy_test_valid_color(`lch(from lch(.7 45 30) l c c / alpha)`, `lch(0.7 45 45)`);
fuzzy_test_valid_color(`lch(from lch(.7 45 30 / 40%) l c c / alpha)`, `lch(0.7 45 45 / 0.4)`);
// Testing with calc().
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) calc(l) calc(c) calc(h))`, `lch(0.7 45 30)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) calc(l) calc(c) calc(h) / calc(alpha))`, `lch(0.7 45 30 / 0.4)`);
fuzzy_test_valid_color(`lch(from lch(50 100 300) calc(l - 20) c h)`, `lch(30 100 300)`);
fuzzy_test_valid_color(`lch(from lch(50 100 300) l calc(c / 2) h)`, `lch(50 50 300)`);
fuzzy_test_valid_color(`lch(from lch(50 100 300) l c calc(h * 2.5))`, `lch(50 100 30)`);
// Testing with 'none'.
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) none none none)`, `lch(none none none)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) none none none / none)`, `lch(none none none / none)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) l c none)`, `lch(0.7 45 none)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) l c none / alpha)`, `lch(0.7 45 none)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30) l c h / none)`, `lch(0.7 45 30 / none)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) l c none / alpha)`, `lch(0.7 45 none / 0.4)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / 40%) l c h / none)`, `lch(0.7 45 30 / none)`);
// FIXME: Clarify with spec editors if 'none' should pass through to the constants.
fuzzy_test_valid_color(`lch(from lch(none none none) l c h)`, `lch(0 0 0)`);
fuzzy_test_valid_color(`lch(from lch(none none none / none) l c h / alpha)`, `lch(0 0 0 / 0)`);
fuzzy_test_valid_color(`lch(from lch(0.7 none 30) l c h)`, `lch(0.7 0 30)`);
fuzzy_test_valid_color(`lch(from lch(0.7 45 30 / none) l c h / alpha)`, `lch(0.7 45 30 / 0)`);
// Testing with 'currentColor'
fuzzy_test_valid_color(`lch(from currentColor) l c h)`, `lch(from currentColor) l c h)`);
// color-mix
fuzzy_test_valid_color(`lch(from color-mix(in lch, lch(70 45 30), lch(70 45 30)) l c h / alpha)`, `lch(70 45 30)`);
// oklch()
// Testing no modifications.
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) l c h)`, `oklch(0.7 0.45 30)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) l c h / alpha)`, `oklch(0.7 0.45 30)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) l c h / alpha)`, `oklch(0.7 0.45 30 / 0.4)`);
fuzzy_test_valid_color(`oklch(from oklch(2 3 400 / 500%) l c h / alpha)`, `oklch(1 3 40)`);
fuzzy_test_valid_color(`oklch(from oklch(-2 -3 -400 / -500%) l c h / alpha)`, `oklch(0 0 320 / 0)`);
// Test nesting relative colors.
fuzzy_test_valid_color(`oklch(from oklch(from oklch(0.7 0.45 30) l c h) l c h)`, `oklch(0.7 0.45 30)`);
// Testing non-sRGB origin colors (no gamut mapping will happen since the destination is not a bounded RGB color space).
fuzzy_test_valid_color(`oklch(from color(display-p3 0 0 0) l c h / alpha)`, `oklch(0 0 0)`);
// TODO: redo conversion with oklab(0.7 0.45 0.3)
fuzzy_test_valid_color(`oklch(from oklab(0.7 45 30) l c h / alpha)`, `oklch(0.7 54.08327 33.690067)`);
// Testing replacement with 0.
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) 0 0 0)`, `oklch(0 0 0)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) 0 0 0deg)`, `oklch(0 0 0)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) 0 0 0 / 0)`, `oklch(0 0 0 / 0)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) 0 0 0deg / 0)`, `oklch(0 0 0 / 0)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) 0 c h / alpha)`, `oklch(0 0.45 30)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) l 0 h / alpha)`, `oklch(0.7 0 30)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) l c 0 / alpha)`, `oklch(0.7 0.45 0)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) l c 0deg / alpha)`, `oklch(0.7 0.45 0)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) l c h / 0)`, `oklch(0.7 0.45 30 / 0)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) 0 c h / alpha)`, `oklch(0 0.45 30 / 0.4)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) l 0 h / alpha)`, `oklch(0.7 0 30 / 0.4)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) l c 0 / alpha)`, `oklch(0.7 0.45 0 / 0.4)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) l c 0deg / alpha)`, `oklch(0.7 0.45 0 / 0.4)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) l c h / 0)`, `oklch(0.7 0.45 30 / 0)`);
// Testing replacement with a constant.
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) 0.25 c h / alpha)`, `oklch(0.25 0.45 30)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) l 0.25 h / alpha)`, `oklch(0.7 0.25 30)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) l c 0.25 / alpha)`, `oklch(0.7 0.45 0.25)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) l c 25deg / alpha)`, `oklch(0.7 0.45 25)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) l c h / .25)`, `oklch(0.7 0.45 30 / 0.25)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) 0.25 c h / alpha)`, `oklch(0.25 0.45 30 / 0.4)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) l 0.25 h / alpha)`, `oklch(0.7 0.25 30 / 0.4)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) l c 0.25 / alpha)`, `oklch(0.7 0.45 0.25 / 0.4)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) l c 25deg / alpha)`, `oklch(0.7 0.45 25 / 0.4)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) l c h / .25)`, `oklch(0.7 0.45 30 / 0.25)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) 2 3 400 / 500)`, `oklch(1 3 40)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) -2 -3 -400 / -500)`, `oklch(0 0 320 / 0)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) 0.5 1.2 400deg / 500)`, `oklch(0.5 1.2 40)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) 0.5 1.2 -400deg / -500)`, `oklch(0.5 1.2 320 / 0)`);
// Testing valid permutation (types match).
// NOTE: 'c' is a vaild hue, as hue is <angle>|<number>.
fuzzy_test_valid_color(`oklch(from oklch(.7 0.45 30) l c c / alpha)`, `oklch(0.7 0.45 0.45)`);
fuzzy_test_valid_color(`oklch(from oklch(.7 0.45 30 / 40%) l c c / alpha)`, `oklch(0.7 0.45 0.45 / 0.4)`);
// Testing with calc().
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) calc(l) calc(c) calc(h))`, `oklch(0.7 0.45 30)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) calc(l) calc(c) calc(h) / calc(alpha))`, `oklch(0.7 0.45 30 / 0.4)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.2 300) calc(l - 0.2) c h)`, `oklch(0.5 0.2 300)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.2 300) l calc(c / 2) h)`, `oklch(0.7 0.1 300)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.2 300) l c calc(h * 2.5))`, `oklch(0.7 0.2 30)`);
// Testing with 'none'.
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) none none none)`, `oklch(none none none)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) none none none / none)`, `oklch(none none none / none)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) l c none)`, `oklch(0.7 0.45 none)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) l c none / alpha)`, `oklch(0.7 0.45 none)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30) l c h / none)`, `oklch(0.7 0.45 30 / none)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) l c none / alpha)`, `oklch(0.7 0.45 none / 0.4)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / 40%) l c h / none)`, `oklch(0.7 0.45 30 / none)`);
// FIXME: Clarify with spec editors if 'none' should pass through to the constants.
fuzzy_test_valid_color(`oklch(from oklch(none none none) l c h)`, `oklch(0 0 0)`);
fuzzy_test_valid_color(`oklch(from oklch(none none none / none) l c h / alpha)`, `oklch(0 0 0 / 0)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 none 30) l c h)`, `oklch(0.7 0 30)`);
fuzzy_test_valid_color(`oklch(from oklch(0.7 0.45 30 / none) l c h / alpha)`, `oklch(0.7 0.45 30 / 0)`);
// color-mix
fuzzy_test_valid_color(`oklch(from color-mix(in oklch, oklch(0.7 0.45 30), oklch(0.7 0.45 30)) l c h / alpha)`, `oklch(0.7 0.45 30)`);
// Testing with 'currentColor'
fuzzy_test_valid_color(`oklch(from currentColor l c h)`, `oklch(from currentColor l c h)`);
for (const colorSpace of [ "srgb", "srgb-linear", "a98-rgb", "rec2020", "prophoto-rgb", "display-p3" ]) {
// Testing no modifications.
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r g b)`, `color(${colorSpace} 0.7 0.5 0.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r g b / alpha)`, `color(${colorSpace} 0.7 0.5 0.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} r g b)`, `color(${colorSpace} 0.7 0.5 0.3 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} r g b / alpha)`, `color(${colorSpace} 0.7 0.5 0.3 / 0.4)`);
// Test nesting relative colors.
fuzzy_test_valid_color(`color(from color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r g b) ${colorSpace} r g b)`, `color(${colorSpace} 0.7 0.5 0.3)`);
// Testing replacement with 0.
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} 0 0 0)`, `color(${colorSpace} 0 0 0)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} 0 0 0 / 0)`, `color(${colorSpace} 0 0 0 / 0)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} 0 g b / alpha)`, `color(${colorSpace} 0 0.5 0.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r 0 b / alpha)`, `color(${colorSpace} 0.7 0 0.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r g 0 / alpha)`, `color(${colorSpace} 0.7 0.5 0)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r g b / 0)`, `color(${colorSpace} 0.7 0.5 0.3 / 0)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} 0 g b / alpha)`, `color(${colorSpace} 0 0.5 0.3 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} r 0 b / alpha)`, `color(${colorSpace} 0.7 0 0.3 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} r g 0 / alpha)`, `color(${colorSpace} 0.7 0.5 0 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} r g b / 0)`, `color(${colorSpace} 0.7 0.5 0.3 / 0)`);
// Testing replacement with a constant.
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} 0.2 g b / alpha)`, `color(${colorSpace} 0.2 0.5 0.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} 20% g b / alpha)`, `color(${colorSpace} 0.2 0.5 0.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r 0.2 b / alpha)`, `color(${colorSpace} 0.7 0.2 0.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r 20% b / alpha)`, `color(${colorSpace} 0.7 0.2 0.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r g 0.2 / alpha)`, `color(${colorSpace} 0.7 0.5 0.2)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r g 20% / alpha)`, `color(${colorSpace} 0.7 0.5 0.2)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r g b / 0.2)`, `color(${colorSpace} 0.7 0.5 0.3 / 0.2)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r g b / 20%)`, `color(${colorSpace} 0.7 0.5 0.3 / 0.2)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} 0.2 g b / alpha)`, `color(${colorSpace} 0.2 0.5 0.3 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} 20% g b / alpha)`, `color(${colorSpace} 0.2 0.5 0.3 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} r 0.2 b / alpha)`, `color(${colorSpace} 0.7 0.2 0.3 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} r 20% b / alpha)`, `color(${colorSpace} 0.7 0.2 0.3 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} r g 0.2 / alpha)`, `color(${colorSpace} 0.7 0.5 0.2 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} r g 20% / alpha)`, `color(${colorSpace} 0.7 0.5 0.2 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} r g b / 0.2)`, `color(${colorSpace} 0.7 0.5 0.3 / 0.2)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} r g b / 20%)`, `color(${colorSpace} 0.7 0.5 0.3 / 0.2)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} 2 3 4)`, `color(${colorSpace} 2 3 4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} 2 3 4 / 5)`, `color(${colorSpace} 2 3 4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} -2 -3 -4)`, `color(${colorSpace} -2 -3 -4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} -2 -3 -4 / -5)`, `color(${colorSpace} -2 -3 -4 / 0)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} 200% 300% 400%)`, `color(${colorSpace} 2 3 4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} 200% 300% 400% / 500%)`, `color(${colorSpace} 2 3 4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} -200% -300% -400%)`, `color(${colorSpace} -2 -3 -4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} -200% -300% -400% / -500%)`, `color(${colorSpace} -2 -3 -4 / 0)`);
// Testing valid permutation (types match).
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} g b r)`, `color(${colorSpace} 0.5 0.3 0.7)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} b alpha r / g)`, `color(${colorSpace} 0.3 1 0.7 / 0.5)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r r r / r)`, `color(${colorSpace} 0.7 0.7 0.7 / 0.7)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} alpha alpha alpha / alpha)`, `color(${colorSpace} 1 1 1)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} g b r)`, `color(${colorSpace} 0.5 0.3 0.7 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} b alpha r / g)`, `color(${colorSpace} 0.3 0.4 0.7 / 0.5)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} r r r / r)`, `color(${colorSpace} 0.7 0.7 0.7 / 0.7)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} alpha alpha alpha / alpha)`, `color(${colorSpace} 0.4 0.4 0.4 / 0.4)`);
// Testing out of gamut components.
fuzzy_test_valid_color(`color(from color(${colorSpace} 1.7 1.5 1.3) ${colorSpace} r g b)`, `color(${colorSpace} 1.7 1.5 1.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 1.7 1.5 1.3) ${colorSpace} r g b / alpha)`, `color(${colorSpace} 1.7 1.5 1.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 1.7 1.5 1.3 / 140%) ${colorSpace} r g b)`, `color(${colorSpace} 1.7 1.5 1.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 1.7 1.5 1.3 / 140%) ${colorSpace} r g b / alpha)`, `color(${colorSpace} 1.7 1.5 1.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} -0.7 -0.5 -0.3) ${colorSpace} r g b)`, `color(${colorSpace} -0.7 -0.5 -0.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} -0.7 -0.5 -0.3) ${colorSpace} r g b / alpha)`, `color(${colorSpace} -0.7 -0.5 -0.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} -0.7 -0.5 -0.3 / -40%) ${colorSpace} r g b)`, `color(${colorSpace} -0.7 -0.5 -0.3 / 0)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} -0.7 -0.5 -0.3 / -40%) ${colorSpace} r g b / alpha)`, `color(${colorSpace} -0.7 -0.5 -0.3 / 0)`);
// Testing with calc().
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} calc(r) calc(g) calc(b))`, `color(${colorSpace} 0.7 0.5 0.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} calc(r) calc(g) calc(b) / calc(alpha))`, `color(${colorSpace} 0.7 0.5 0.3 / 0.4)`);
// Testing with 'none'.
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} none none none)`, `color(${colorSpace} none none none)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} none none none / none)`, `color(${colorSpace} none none none / none)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r g none)`, `color(${colorSpace} 0.7 0.5 none)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r g none / alpha)`, `color(${colorSpace} 0.7 0.5 none)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3) ${colorSpace} r g b / none)`, `color(${colorSpace} 0.7 0.5 0.3 / none)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} r g none / alpha)`, `color(${colorSpace} 0.7 0.5 none / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / 40%) ${colorSpace} r g b / none)`, `color(${colorSpace} 0.7 0.5 0.3 / none)`);
// FIXME: Clarify with spec editors if 'none' should pass through to the constants.
fuzzy_test_valid_color(`color(from color(${colorSpace} none none none) ${colorSpace} r g b)`, `color(${colorSpace} 0 0 0)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} none none none / none) ${colorSpace} r g b / alpha)`, `color(${colorSpace} 0 0 0 / 0)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 none 0.3) ${colorSpace} r g b)`, `color(${colorSpace} 0.7 0 0.3)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 0.7 0.5 0.3 / none) ${colorSpace} r g b / alpha)`, `color(${colorSpace} 0.7 0.5 0.3 / 0)`);
// Testing with 'currentColor'
fuzzy_test_valid_color(`color(from currentColor ${colorSpace} r g b)`, `color(from currentColor ${colorSpace} r g b)`);
// color-mix
fuzzy_test_valid_color(`color(from color-mix(in xyz, color(${colorSpace} 0.7 0.5 0.3), color(${colorSpace} 0.7 0.5 0.3)) ${colorSpace} r g b / alpha)`, `color(${colorSpace} 0.7 0.5 0.3)`);
}
for (const colorSpace of [ "xyz", "xyz-d50", "xyz-d65" ]) {
const resultColorSpace = colorSpace == "xyz" ? "xyz-d65" : colorSpace;
// Testing no modifications.
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} x y z)`, `color(${resultColorSpace} 7 -20.5 100)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} x y z / alpha)`, `color(${resultColorSpace} 7 -20.5 100)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / 40%) ${colorSpace} x y z)`, `color(${resultColorSpace} 7 -20.5 100 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / 40%) ${colorSpace} x y z / alpha)`, `color(${resultColorSpace} 7 -20.5 100 / 0.4)`);
// Test nesting relative colors.
fuzzy_test_valid_color(`color(from color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} x y z) ${colorSpace} x y z)`, `color(${resultColorSpace} 7 -20.5 100)`);
// Testing replacement with 0.
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} 0 0 0)`, `color(${resultColorSpace} 0 0 0)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} 0 0 0 / 0)`, `color(${resultColorSpace} 0 0 0 / 0)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} 0 y z / alpha)`, `color(${resultColorSpace} 0 -20.5 100)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} x 0 z / alpha)`, `color(${resultColorSpace} 7 0 100)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} x y 0 / alpha)`, `color(${resultColorSpace} 7 -20.5 0)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} x y z / 0)`, `color(${resultColorSpace} 7 -20.5 100 / 0)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / 40%) ${colorSpace} 0 y z / alpha)`, `color(${resultColorSpace} 0 -20.5 100 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / 40%) ${colorSpace} x 0 z / alpha)`, `color(${resultColorSpace} 7 0 100 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / 40%) ${colorSpace} x y 0 / alpha)`, `color(${resultColorSpace} 7 -20.5 0 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / 40%) ${colorSpace} x y z / 0)`, `color(${resultColorSpace} 7 -20.5 100 / 0)`);
// Testing replacement with a constant.
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} 0.2 y z / alpha)`, `color(${resultColorSpace} 0.2 -20.5 100)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} x 0.2 z / alpha)`, `color(${resultColorSpace} 7 0.2 100)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} x y 0.2 / alpha)`, `color(${resultColorSpace} 7 -20.5 0.2)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} x y z / 0.2)`, `color(${resultColorSpace} 7 -20.5 100 / 0.2)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} x y z / 20%)`, `color(${resultColorSpace} 7 -20.5 100 / 0.2)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / 40%) ${colorSpace} 0.2 y z / alpha)`, `color(${resultColorSpace} 0.2 -20.5 100 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / 40%) ${colorSpace} x 0.2 z / alpha)`, `color(${resultColorSpace} 7 0.2 100 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / 40%) ${colorSpace} x y 0.2 / alpha)`, `color(${resultColorSpace} 7 -20.5 0.2 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / 40%) ${colorSpace} x y z / 0.2)`, `color(${resultColorSpace} 7 -20.5 100 / 0.2)`);
// Testing valid permutation (types match).
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} y z x)`, `color(${resultColorSpace} -20.5 100 7)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} x x x / x)`, `color(${resultColorSpace} 7 7 7)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / 40%) ${colorSpace} y z x)`, `color(${resultColorSpace} -20.5 100 7 / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / 40%) ${colorSpace} x x x / x)`, `color(${resultColorSpace} 7 7 7)`);
// Testing with calc().
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} calc(x) calc(y) calc(z))`, `color(${resultColorSpace} 7 -20.5 100)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / 40%) ${colorSpace} calc(x) calc(y) calc(z) / calc(alpha))`, `color(${resultColorSpace} 7 -20.5 100 / 0.4)`);
// Testing with 'none'.
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} none none none)`, `color(${resultColorSpace} none none none)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} none none none / none)`, `color(${resultColorSpace} none none none / none)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} x y none)`, `color(${resultColorSpace} 7 -20.5 none)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} x y none / alpha)`, `color(${resultColorSpace} 7 -20.5 none)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100) ${colorSpace} x y z / none)`, `color(${resultColorSpace} 7 -20.5 100 / none)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / 40%) ${colorSpace} x y none / alpha)`, `color(${resultColorSpace} 7 -20.5 none / 0.4)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / 40%) ${colorSpace} x y z / none)`, `color(${resultColorSpace} 7 -20.5 100 / none)`);
// FIXME: Clarify with spec editors if 'none' should pass through to the constants.
fuzzy_test_valid_color(`color(from color(${colorSpace} none none none) ${colorSpace} x y z)`, `color(${resultColorSpace} 0 0 0)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} none none none / none) ${colorSpace} x y z / alpha)`, `color(${resultColorSpace} 0 0 0 / 0)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 none 100) ${colorSpace} x y z)`, `color(${resultColorSpace} 7 0 100)`);
fuzzy_test_valid_color(`color(from color(${colorSpace} 7 -20.5 100 / none) ${colorSpace} x y z / alpha)`, `color(${resultColorSpace} 7 -20.5 100 / 0)`);
// Testing with 'currentColor'
fuzzy_test_valid_color(`color(from currentColor ${colorSpace} x y z)`, `color(from currentColor ${colorSpace} x y z)`);
// color-mix
fuzzy_test_valid_color(`color(from color-mix(in xyz, color(${colorSpace} 0.7 0.5 0.3), color(${colorSpace} 0.7 0.5 0.3)) ${colorSpace} x y z / alpha)`, `color(${resultColorSpace} 0.7 0.5 0.3)`);
}
// Spec Examples: https://www.w3.org/TR/css-color-5/#relative-colors
fuzzy_test_valid_color(`rgb(from var(--bg-color) r g b / 80%)`);
fuzzy_test_valid_color(`lch(from var(--color) calc(l / 2) c h)`);
fuzzy_test_valid_color(`rgb(from var(--color) calc(r * .3 + g * .59 + b * .11) calc(r * .3 + g * .59 + b * .11) calc(r * .3 + g * .59 + b * .11))`);
fuzzy_test_valid_color(`lch(from var(--color) l 0 h)`);
// This particular test does a lot of math so a wider epsilon is needed.
fuzzy_test_valid_color(`rgb(from indianred 255 g b)`, `color(srgb 1 0.36 0.36)`, 0.02 /* epsilon */);
fuzzy_test_valid_color(`hsl(from var(--accent) calc(h + 180) s l)`);
fuzzy_test_valid_color(`lab(from var(--mycolor) l a b / 100%)`);
fuzzy_test_valid_color(`lab(from var(--mycolor) l a b / calc(alpha * 0.8))`);
fuzzy_test_valid_color(`lab(from var(--mycolor) l 0 0)`);
// This particular test does a lot of math so a wider epsilon is needed.
fuzzy_test_valid_color(`lch(from peru calc(l * 0.8) c h)`, `lch(49.80 54 63.68)`, 0.02 /* epsilon */);
fuzzy_test_valid_color(`LCH(from var(--accent) l c calc(h + 180))`);
fuzzy_test_valid_color(`lch(from var(--mycolor) l 0 h)`);
fuzzy_test_valid_color(`var(--mygray)`);
fuzzy_test_valid_color(`lch(from var(--mygray) l 30 h)`);
</script>
</body>
</html>