diff --git a/layout/reftests/scrolling/scroll-behavior-2.html b/layout/reftests/scrolling/scroll-behavior-2.html
index 7a01eb010068..9987a907f058 100644
--- a/layout/reftests/scrolling/scroll-behavior-2.html
+++ b/layout/reftests/scrolling/scroll-behavior-2.html
@@ -35,6 +35,7 @@
             width: 50px;
             height: 50px;
             overflow: scroll;
+            will-change: scroll-position;
         }
 
         #scroll_1, #scroll_2, #scroll_3, #scroll_6 {
diff --git a/layout/reftests/scrolling/scroll-behavior-3.html b/layout/reftests/scrolling/scroll-behavior-3.html
index e6e4ad1615a5..87156b750b35 100644
--- a/layout/reftests/scrolling/scroll-behavior-3.html
+++ b/layout/reftests/scrolling/scroll-behavior-3.html
@@ -35,6 +35,7 @@
             width: 50px;
             height: 50px;
             overflow: scroll;
+            will-change: scroll-position;
         }
 
         #scroll_1, #scroll_4, #scroll_6, #scroll_8 {
diff --git a/layout/reftests/scrolling/scroll-behavior-4.html b/layout/reftests/scrolling/scroll-behavior-4.html
index f19b59d154c4..ea1855419c83 100644
--- a/layout/reftests/scrolling/scroll-behavior-4.html
+++ b/layout/reftests/scrolling/scroll-behavior-4.html
@@ -28,14 +28,15 @@
             top: 2000px;
             width: 20px;
             height: 20px;
-	    background: green;
-	    display: inline-block;
+            background: green;
+            display: inline-block;
         }
 
         .scroll_box {
             width: 50px;
             height: 50px;
             overflow: scroll;
+            will-change: scroll-position;
         }
 
         #scroll_1 {
diff --git a/layout/reftests/scrolling/scroll-behavior-6.html b/layout/reftests/scrolling/scroll-behavior-6.html
index 667df8a1413d..3f169412f88f 100644
--- a/layout/reftests/scrolling/scroll-behavior-6.html
+++ b/layout/reftests/scrolling/scroll-behavior-6.html
@@ -35,6 +35,7 @@
             width: 50px;
             height: 50px;
             overflow: scroll;
+            will-change: scroll-position;
         }
 
     </style>