diff --git a/Libraries/LibWeb/CSS/Properties.json b/Libraries/LibWeb/CSS/Properties.json
index e49b63ce66e..2ad67abe37f 100644
--- a/Libraries/LibWeb/CSS/Properties.json
+++ b/Libraries/LibWeb/CSS/Properties.json
@@ -383,7 +383,8 @@
     "longhands": [
       "background-position-x",
       "background-position-y"
-    ]
+    ],
+    "percentages-resolve-to": "length"
   },
   "background-position-x": {
     "affects-layout": false,
@@ -613,7 +614,8 @@
       "border-top-right-radius",
       "border-bottom-left-radius",
       "border-bottom-right-radius"
-    ]
+    ],
+    "percentages-resolve-to": "length"
   },
   "border-right": {
     "inherited": false,
@@ -1083,8 +1085,7 @@
     "valid-types": [
       "number [-∞,∞]",
       "percentage [-∞,∞]"
-    ],
-    "percentages-resolve-to": "number"
+    ]
   },
   "fill-rule": {
     "affects-layout": false,
@@ -2130,7 +2131,8 @@
     "initial": "50% 50%",
     "valid-types": [
       "position"
-    ]
+    ],
+    "percentages-resolve-to": "length"
   },
   "opacity": {
     "animation-type": "by-computed-value",
@@ -2142,7 +2144,7 @@
       "number [-∞,∞]",
       "percentage [-∞,∞]"
     ],
-    "percentages-resolve-to": "number"
+    "__comment": "We don't have a percentages-resolve-to here because even though we're supposed to map percentages to [0,1], calc(10%) should resolve to 10% not 0.1."
   },
   "order": {
     "animation-type": "by-computed-value",
@@ -2530,7 +2532,7 @@
       "number [-∞,∞]",
       "percentage [-∞,∞]"
     ],
-    "percentages-resolve-to": "number"
+    "__comment": "We don't have a percentages-resolve-to here for the same reason as for opacity."
   },
   "stroke": {
     "affects-layout": false,
@@ -2595,7 +2597,7 @@
       "number [-∞,∞]",
       "percentage [-∞,∞]"
     ],
-    "percentages-resolve-to": "number"
+    "__comment": "We don't have a percentages-resolve-to here for the same reason as for opacity."
   },
   "stroke-width": {
     "affects-layout": false,
diff --git a/Tests/LibWeb/Text/expected/css/calc-coverage.txt b/Tests/LibWeb/Text/expected/css/calc-coverage.txt
index d48985cbad6..185ebf9bafb 100644
--- a/Tests/LibWeb/Text/expected/css/calc-coverage.txt
+++ b/Tests/LibWeb/Text/expected/css/calc-coverage.txt
@@ -139,7 +139,7 @@ ry: 'calc(2% * var(--n))' -> 'calc(2% * 2)'
 stop-opacity: 'calc(2)' -> '2'
 stop-opacity: 'calc(2 * var(--n))' -> '4'
 stroke-opacity: 'calc(2%)' -> '2%'
-stroke-opacity: 'calc(2% * var(--n))' -> 'calc(2% * 2)'
+stroke-opacity: 'calc(2% * var(--n))' -> '4%'
 stroke-width: 'calc(2px)' -> '2px'
 stroke-width: 'calc(2px * var(--n))' -> '4px'
 tab-size: 'calc(2px)' -> '2px'