diff --git a/tests/wpt/mozilla/tests/css/linear_gradients_lengths_a.html b/tests/wpt/mozilla/tests/css/linear_gradients_lengths_a.html
index 7cc0c449f5f..36ab50d6866 100644
--- a/tests/wpt/mozilla/tests/css/linear_gradients_lengths_a.html
+++ b/tests/wpt/mozilla/tests/css/linear_gradients_lengths_a.html
@@ -9,9 +9,10 @@ section {
     width: 100px;
     height: 100px;
     border: solid black 1px;
+    background-clip: content-box;
 }
 #a {
-    background: linear-gradient(to right, white, white 30px, black 30px, black);
+    background-image: linear-gradient(to right, white, white 30px, black 30px, black);
 }
 </style>
 </head>
diff --git a/tests/wpt/mozilla/tests/css/linear_gradients_lengths_ref.html b/tests/wpt/mozilla/tests/css/linear_gradients_lengths_ref.html
index 3a9aec01525..a067067fff6 100644
--- a/tests/wpt/mozilla/tests/css/linear_gradients_lengths_ref.html
+++ b/tests/wpt/mozilla/tests/css/linear_gradients_lengths_ref.html
@@ -8,9 +8,10 @@ section {
     width: 100px;
     height: 100px;
     border: solid black 1px;
+    background-clip: content-box;
 }
 #a {
-    background: linear-gradient(to right, white, white 30%, black 30%, black);
+    background-image: linear-gradient(to right, white, white 30%, black 30%, black);
 }
 </style>
 </head>