diff --git a/servo/components/style/color/color_function.rs b/servo/components/style/color/color_function.rs
index 426256a2e92b..2898dc3fb113 100644
--- a/servo/components/style/color/color_function.rs
+++ b/servo/components/style/color/color_function.rs
@@ -114,8 +114,20 @@ impl ColorFunction {
                 let mut result = AbsoluteColor::new(
                     ColorSpace::Hsl,
                     value!(h).map(|angle| normalize_hue(angle.degrees())),
-                    value!(s).map(|s| s.to_number(SATURATION_RANGE).clamp(0.0, SATURATION_RANGE)),
-                    value!(l).map(|l| l.to_number(LIGHTNESS_RANGE).clamp(0.0, LIGHTNESS_RANGE)),
+                    value!(s).map(|s| {
+                        if *is_legacy_syntax {
+                            s.to_number(SATURATION_RANGE).clamp(0.0, SATURATION_RANGE)
+                        } else {
+                            s.to_number(SATURATION_RANGE)
+                        }
+                    }),
+                    value!(l).map(|l| {
+                        if *is_legacy_syntax {
+                            l.to_number(LIGHTNESS_RANGE).clamp(0.0, LIGHTNESS_RANGE)
+                        } else {
+                            l.to_number(LIGHTNESS_RANGE)
+                        }
+                    }),
                     alpha!(alpha),
                 );
 
@@ -133,8 +145,20 @@ impl ColorFunction {
                 let mut result = AbsoluteColor::new(
                     ColorSpace::Hwb,
                     value!(h).map(|angle| normalize_hue(angle.degrees())),
-                    value!(w).map(|w| w.to_number(WHITENESS_RANGE).clamp(0.0, WHITENESS_RANGE)),
-                    value!(b).map(|b| b.to_number(BLACKNESS_RANGE).clamp(0.0, BLACKNESS_RANGE)),
+                    value!(w).map(|w| {
+                        if *is_legacy_syntax {
+                            w.to_number(WHITENESS_RANGE).clamp(0.0, WHITENESS_RANGE)
+                        } else {
+                            w.to_number(WHITENESS_RANGE)
+                        }
+                    }),
+                    value!(b).map(|b| {
+                        if *is_legacy_syntax {
+                            b.to_number(BLACKNESS_RANGE).clamp(0.0, BLACKNESS_RANGE)
+                        } else {
+                            b.to_number(BLACKNESS_RANGE)
+                        }
+                    }),
                     alpha!(alpha),
                 );
 
diff --git a/testing/web-platform/meta/css/css-color/parsing/color-computed-relative-color.html.ini b/testing/web-platform/meta/css/css-color/parsing/color-computed-relative-color.html.ini
index 214fb8ed1427..63845a806eb0 100644
--- a/testing/web-platform/meta/css/css-color/parsing/color-computed-relative-color.html.ini
+++ b/testing/web-platform/meta/css/css-color/parsing/color-computed-relative-color.html.ini
@@ -16,9 +16,3 @@
 
   [Property color value 'lch(from color(srgb 0.25 0.5 0.75) l c h)']
     expected: FAIL
-
-  [Property color value 'color(from hsl(from color(xyz-d50 0.99 0.88 0.77) h s l) xyz-d50 x y z)']
-    expected: FAIL
-
-  [Property color value 'color(from hsl(from color(xyz-d65 0.99 0.88 0.77) h s l) xyz-d65 x y z)']
-    expected: FAIL
diff --git a/testing/web-platform/meta/css/css-color/parsing/relative-color-out-of-gamut.html.ini b/testing/web-platform/meta/css/css-color/parsing/relative-color-out-of-gamut.html.ini
deleted file mode 100644
index 0c8198b02fb5..000000000000
--- a/testing/web-platform/meta/css/css-color/parsing/relative-color-out-of-gamut.html.ini
+++ /dev/null
@@ -1,54 +0,0 @@
-[relative-color-out-of-gamut.html]
-  [Property color value 'hsl(from color(display-p3 0 1 0) h s l / alpha)']
-    expected: FAIL
-
-  [Property color value 'hsl(from lab(100 104.3 -50.9) h s l)']
-    expected: FAIL
-
-  [Property color value 'hsl(from lab(0 104.3 -50.9) h s l)']
-    expected: FAIL
-
-  [Property color value 'hsl(from lch(100 116 334) h s l)']
-    expected: FAIL
-
-  [Property color value 'hsl(from lch(0 116 334) h s l)']
-    expected: FAIL
-
-  [Property color value 'hsl(from oklab(1 0.365 -0.16) h s l)']
-    expected: FAIL
-
-  [Property color value 'hsl(from oklab(0 0.365 -0.16) h s l)']
-    expected: FAIL
-
-  [Property color value 'hsl(from oklch(1 0.399 336.3) h s l)']
-    expected: FAIL
-
-  [Property color value 'hsl(from oklch(0 0.399 336.3) h s l)']
-    expected: FAIL
-
-  [Property color value 'hwb(from color(display-p3 0 1 0) h w b / alpha)']
-    expected: FAIL
-
-  [Property color value 'hwb(from lab(100 104.3 -50.9) h w b)']
-    expected: FAIL
-
-  [Property color value 'hwb(from lab(0 104.3 -50.9) h w b)']
-    expected: FAIL
-
-  [Property color value 'hwb(from lch(100 116 334) h w b)']
-    expected: FAIL
-
-  [Property color value 'hwb(from lch(0 116 334) h w b)']
-    expected: FAIL
-
-  [Property color value 'hwb(from oklab(1 0.365 -0.16) h w b)']
-    expected: FAIL
-
-  [Property color value 'hwb(from oklab(0 0.365 -0.16) h w b)']
-    expected: FAIL
-
-  [Property color value 'hwb(from oklch(1 0.399 336.3) h w b)']
-    expected: FAIL
-
-  [Property color value 'hwb(from oklch(0 0.399 336.3) h w b)']
-    expected: FAIL