diff --git a/css/css-color/parsing/color-computed-color-function.html b/css/css-color/parsing/color-computed-color-function.html
index e610754c644a4e..530a605bc9292f 100644
--- a/css/css-color/parsing/color-computed-color-function.html
+++ b/css/css-color/parsing/color-computed-color-function.html
@@ -31,12 +31,6 @@
     test_computed_value("color", `color(${colorSpace} 0 0 0 / -10%)`, `color(${colorSpace} 0 0 0 / 0)`);
     test_computed_value("color", `color(${colorSpace} 0 0 0 / 110%)`, `color(${colorSpace} 0 0 0)`);
     test_computed_value("color", `color(${colorSpace} 0 0 0 / 300%)`, `color(${colorSpace} 0 0 0)`);
-    test_computed_value("color", `color(${colorSpace} 50% -200)`, `color(${colorSpace} 0.5 -200 0)`);
-    test_computed_value("color", `color(${colorSpace} 50%)`, `color(${colorSpace} 0.5 0 0)`);
-    test_computed_value("color", `color(${colorSpace})`, `color(${colorSpace} 0 0 0)`);
-    test_computed_value("color", `color(${colorSpace} 50% -200 / 0.5)`, `color(${colorSpace} 0.5 -200 0 / 0.5)`);
-    test_computed_value("color", `color(${colorSpace} 50% / 0.5)`, `color(${colorSpace} 0.5 0 0 / 0.5)`);
-    test_computed_value("color", `color(${colorSpace} / 0.5)`, `color(${colorSpace} 0 0 0 / 0.5)`);
     test_computed_value("color", `color(${colorSpace} 200 200 200)`, `color(${colorSpace} 200 200 200)`);
     test_computed_value("color", `color(${colorSpace} 200 200 200 / 200)`, `color(${colorSpace} 200 200 200)`);
     test_computed_value("color", `color(${colorSpace} -200 -200 -200)`, `color(${colorSpace} -200 -200 -200)`);
@@ -71,12 +65,6 @@
     test_computed_value("color", `color(${colorSpace} 0 0 0 / -10%)`, `color(${resultColorSpace} 0 0 0 / 0)`);
     test_computed_value("color", `color(${colorSpace} 0 0 0 / 110%)`, `color(${resultColorSpace} 0 0 0)`);
     test_computed_value("color", `color(${colorSpace} 0 0 0 / 300%)`, `color(${resultColorSpace} 0 0 0)`);
-    test_computed_value("color", `color(${colorSpace} 1 1)`, `color(${resultColorSpace} 1 1 0)`);
-    test_computed_value("color", `color(${colorSpace} 1)`, `color(${resultColorSpace} 1 0 0)`);
-    test_computed_value("color", `color(${colorSpace})`, `color(${resultColorSpace} 0 0 0)`);
-    test_computed_value("color", `color(${colorSpace} 1 1 / .5)`, `color(${resultColorSpace} 1 1 0 / 0.5)`);
-    test_computed_value("color", `color(${colorSpace} 1 / 0.5)`, `color(${resultColorSpace} 1 0 0 / 0.5)`);
-    test_computed_value("color", `color(${colorSpace} / 50%)`, `color(${resultColorSpace} 0 0 0 / 0.5)`);
     test_computed_value("color", `color(${colorSpace} calc(0.5 + 1) calc(0.5 - 1) calc(0.5) / calc(-0.5 + 1))`, `color(${resultColorSpace} 1.5 -0.5 0.5 / 0.5)`);
 
     test_computed_value("color", `color(${colorSpace} none none none / none)`, `color(${resultColorSpace} none none none / none)`);
@@ -276,9 +264,6 @@
 test_computed_value("color", "color(srgb 1 1 1 / 0)", "color(srgb 1 1 1 / 0)", "[sRGB white with 0 alpha]");
 test_computed_value("color", "color(srgb 1 1 1 / 50%)", "color(srgb 1 1 1 / 0.5)", "[sRGB white with 50% alpha]");
 test_computed_value("color", "color(srgb 1 1 1 / 0%)", "color(srgb 1 1 1 / 0)", "[sRGB white with 0% alpha]");
-test_computed_value("color", "color(srgb 1 1)", "color(srgb 1 1 0)", "[One missing component is 0]");
-test_computed_value("color", "color(srgb 1)", "color(srgb 1 0 0)", "[Two missing components are 0]");
-test_computed_value("color", "color(srgb)", "color(srgb 0 0 0)", "[All components missing]");
 test_computed_value("color", "color(display-p3 0.6 0.7 0.8)", "color(display-p3 0.6 0.7 0.8)", "[Display P3 color]");
 test_computed_value("color", "color(dIspLaY-P3 0.6 0.7 0.8)", "color(display-p3 0.6 0.7 0.8)", "[Different case for Display P3]");
 
diff --git a/css/css-color/parsing/color-invalid-color-function.html b/css/css-color/parsing/color-invalid-color-function.html
index 75d9ff7c21764b..51f393747c19a2 100644
--- a/css/css-color/parsing/color-invalid-color-function.html
+++ b/css/css-color/parsing/color-invalid-color-function.html
@@ -20,6 +20,13 @@
     test_invalid_value("color", `color(${colorSpace} 0% 0 0deg)`);
     test_invalid_value("color", `color(${colorSpace} 0% 0% 0deg)`);
     test_invalid_value("color", `color(${colorSpace} 40% 0 0deg)`);
+    // Missing parameters should not parse
+    test_invalid_value("color", `color(${colorSpace} 50% -200)`);
+    test_invalid_value("color", `color(${colorSpace} 50%)`);
+    test_invalid_value("color", `color(${colorSpace})`);
+    test_invalid_value("color", `color(${colorSpace} 50% -200 / 0.5)`);
+    test_invalid_value("color", `color(${colorSpace} 50% / 0.5)`);
+    test_invalid_value("color", `color(${colorSpace} / 0.5)`);
 }
 
 for (const colorSpace of [ "xyz", "xyz-d50", "xyz-d65" ]) {
@@ -30,6 +37,13 @@
     test_invalid_value("color", `color(${colorSpace} 0% 0 0deg)`);
     test_invalid_value("color", `color(${colorSpace} 0% 0% 0deg)`);
     test_invalid_value("color", `color(${colorSpace} 40% 0 0deg)`);
+    // Missing parameters should not parse
+    test_invalid_value("color", `color(${colorSpace} 1 1)`);
+    test_invalid_value("color", `color(${colorSpace} 1)`);
+    test_invalid_value("color", `color(${colorSpace})`);
+    test_invalid_value("color", `color(${colorSpace} 1 1 / .5)`);
+    test_invalid_value("color", `color(${colorSpace} 1 / 0.5)`);
+    test_invalid_value("color", `color(${colorSpace} / 50%)`);
 }
 
 test_invalid_value("color", "color()");  // Empty
diff --git a/css/css-color/parsing/color-valid-color-function.html b/css/css-color/parsing/color-valid-color-function.html
index 79e0bde059013d..1eb7c744b2acee 100644
--- a/css/css-color/parsing/color-valid-color-function.html
+++ b/css/css-color/parsing/color-valid-color-function.html
@@ -26,12 +26,6 @@
     test_valid_value("color", `color(${colorSpace} 0 0 0 / -10%)`, `color(${colorSpace} 0 0 0 / 0)`);
     test_valid_value("color", `color(${colorSpace} 0 0 0 / 110%)`, `color(${colorSpace} 0 0 0)`);
     test_valid_value("color", `color(${colorSpace} 0 0 0 / 300%)`, `color(${colorSpace} 0 0 0)`);
-    test_valid_value("color", `color(${colorSpace} 50% -200)`, `color(${colorSpace} 0.5 -200 0)`);
-    test_valid_value("color", `color(${colorSpace} 50%)`, `color(${colorSpace} 0.5 0 0)`);
-    test_valid_value("color", `color(${colorSpace})`, `color(${colorSpace} 0 0 0)`);
-    test_valid_value("color", `color(${colorSpace} 50% -200 / 0.5)`, `color(${colorSpace} 0.5 -200 0 / 0.5)`);
-    test_valid_value("color", `color(${colorSpace} 50% / 0.5)`, `color(${colorSpace} 0.5 0 0 / 0.5)`);
-    test_valid_value("color", `color(${colorSpace} / 0.5)`, `color(${colorSpace} 0 0 0 / 0.5)`);
     test_valid_value("color", `color(${colorSpace} 200 200 200)`, `color(${colorSpace} 200 200 200)`);
     test_valid_value("color", `color(${colorSpace} 200 200 200 / 200)`, `color(${colorSpace} 200 200 200)`);
     test_valid_value("color", `color(${colorSpace} -200 -200 -200)`, `color(${colorSpace} -200 -200 -200)`);
@@ -66,12 +60,6 @@
     test_valid_value("color", `color(${colorSpace} 0 0 0 / -10%)`, `color(${resultColorSpace} 0 0 0 / 0)`);
     test_valid_value("color", `color(${colorSpace} 0 0 0 / 110%)`, `color(${resultColorSpace} 0 0 0)`);
     test_valid_value("color", `color(${colorSpace} 0 0 0 / 300%)`, `color(${resultColorSpace} 0 0 0)`);
-    test_valid_value("color", `color(${colorSpace} 1 1)`, `color(${resultColorSpace} 1 1 0)`);
-    test_valid_value("color", `color(${colorSpace} 1)`, `color(${resultColorSpace} 1 0 0)`);
-    test_valid_value("color", `color(${colorSpace})`, `color(${resultColorSpace} 0 0 0)`);
-    test_valid_value("color", `color(${colorSpace} 1 1 / .5)`, `color(${resultColorSpace} 1 1 0 / 0.5)`);
-    test_valid_value("color", `color(${colorSpace} 1 / 0.5)`, `color(${resultColorSpace} 1 0 0 / 0.5)`);
-    test_valid_value("color", `color(${colorSpace} / 50%)`, `color(${resultColorSpace} 0 0 0 / 0.5)`);
     test_valid_value("color", `color(${colorSpace} calc(0.5 + 1) calc(0.5 - 1) calc(0.5) / calc(-0.5 + 1))`, `color(${resultColorSpace} 1.5 -0.5 0.5 / 0.5)`);
 
     test_valid_value("color", `color(${colorSpace} none none none / none)`, `color(${resultColorSpace} none none none / none)`);