diff --git a/layout/reftests/w3c-css/submitted/masking/mask-image-3b.html b/layout/reftests/w3c-css/submitted/masking/mask-image-3b.html
index 50cc1666d79b..3d4d646e7c57 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-image-3b.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-image-3b.html
@@ -18,6 +18,7 @@
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg), url(#mask1);
         mask-repeat: no-repeat, repeat;
+        mask-position: 0 0, 0 0;
         width: 100px;
         height: 100px;
       }
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-image-3c.html b/layout/reftests/w3c-css/submitted/masking/mask-image-3c.html
index e129fa9e9f80..88f808c6f5a6 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-image-3c.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-image-3c.html
@@ -18,6 +18,7 @@
         background-color: purple;
         mask-image: url(#mask1), url(support/50x50-opaque-blue.svg);
         mask-repeat: repeat-x, no-repeat;
+        mask-position: 0 0, 0 0;
         width: 100px;
         height: 100px;
       }
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-image-3d.html b/layout/reftests/w3c-css/submitted/masking/mask-image-3d.html
index e0330d1a644e..140431697de5 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-image-3d.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-image-3d.html
@@ -18,6 +18,7 @@
         background-color: purple;
         mask: url(#mask1), url(support/50x50-opaque-blue.svg);
         mask-repeat: no-repeat, no-repeat;
+        mask-position: 0 0, 0 0;
         width: 100px;
         height: 100px;
       }
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-image-3e.html b/layout/reftests/w3c-css/submitted/masking/mask-image-3e.html
index f2bd4ed993dc..207ca117a34a 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-image-3e.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-image-3e.html
@@ -25,6 +25,7 @@
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg), url(#mask1);
         mask-repeat: no-repeat, repeat;
+        mask-position: 0 0, 0 0;
         /*mask: url(#mask1);*/
         width: 100px;
         height: 100px;
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-repeat-1.html b/layout/reftests/w3c-css/submitted/masking/mask-repeat-1.html
index af9225daae7d..a7fc586fd530 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-repeat-1.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-repeat-1.html
@@ -21,6 +21,7 @@
       div.inner {
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg);
+        mask-position: left top;
       }
 
       #no-repeat {
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-repeat-2.html b/layout/reftests/w3c-css/submitted/masking/mask-repeat-2.html
index 65eb2a43afa0..e349239fbfcb 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-repeat-2.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-repeat-2.html
@@ -21,6 +21,7 @@
       div.inner {
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg);
+        mask-position: left top;
       }
 
       #space {
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-repeat-3.html b/layout/reftests/w3c-css/submitted/masking/mask-repeat-3.html
index 540e47c69b05..cb950d4f2c4e 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-repeat-3.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-repeat-3.html
@@ -21,6 +21,7 @@
       div.inner {
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg);
+        mask-position: left top;
       }
 
       #round {
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-auto-auto.html b/layout/reftests/w3c-css/submitted/masking/mask-size-auto-auto.html
index cf69930e064f..01d55f96298f 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-auto-auto.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-auto-auto.html
@@ -22,6 +22,7 @@
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-size: auto auto;
       }
     </style>
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-auto-length.html b/layout/reftests/w3c-css/submitted/masking/mask-size-auto-length.html
index 10602567d494..5ef49cc612f6 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-auto-length.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-auto-length.html
@@ -21,6 +21,7 @@
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-size: auto 20px;
       }
     </style>
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-auto-percent.html b/layout/reftests/w3c-css/submitted/masking/mask-size-auto-percent.html
index 5f613ec4b51c..f2644bb1b018 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-auto-percent.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-auto-percent.html
@@ -21,6 +21,7 @@
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-size: auto 15.625%;
       }
     </style>
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-auto.html b/layout/reftests/w3c-css/submitted/masking/mask-size-auto.html
index 19ff1369e6fe..6560a81ee3de 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-auto.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-auto.html
@@ -22,6 +22,7 @@
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-size: auto;
       }
     </style>
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-contain-clip-border.html b/layout/reftests/w3c-css/submitted/masking/mask-size-contain-clip-border.html
index af87520d2fda..a04557639a72 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-contain-clip-border.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-contain-clip-border.html
@@ -22,6 +22,7 @@
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-clip: border-box;
         mask-origin: border-box;
         mask-size: contain;
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-contain-clip-padding.html b/layout/reftests/w3c-css/submitted/masking/mask-size-contain-clip-padding.html
index dc093d94d0c8..4f321d9c58f6 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-contain-clip-padding.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-contain-clip-padding.html
@@ -22,6 +22,7 @@
         height: 88px;
         mask-image: url(support/50x50-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-clip: padding-box;
         mask-origin: padding-box;
         mask-size: contain;
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-contain-position-fifty-fifty.html b/layout/reftests/w3c-css/submitted/masking/mask-size-contain-position-fifty-fifty.html
index 2be2428a7b13..fcae5ba0ed29 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-contain-position-fifty-fifty.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-contain-position-fifty-fifty.html
@@ -22,6 +22,7 @@
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-size: contain;
         mask-position: 50% 50%;
       }
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-contain.html b/layout/reftests/w3c-css/submitted/masking/mask-size-contain.html
index f4b8cef7933d..19fc42d6ec51 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-contain.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-contain.html
@@ -22,6 +22,7 @@
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-size: contain;
       }
     </style>
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-cover.html b/layout/reftests/w3c-css/submitted/masking/mask-size-cover.html
index 9329ea70b76b..171e11805b3b 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-cover.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-cover.html
@@ -16,6 +16,7 @@
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-origin: content-box;
         mask-clip: content-box;
         mask-size: cover;
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-length-auto.html b/layout/reftests/w3c-css/submitted/masking/mask-size-length-auto.html
index 2fcc74c08407..7152f6ff954f 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-length-auto.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-length-auto.html
@@ -22,6 +22,7 @@
         background-color: purple;
         mask-image: url(support/50x100-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-size: 32px auto;
       }
     </style>
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-length-length.html b/layout/reftests/w3c-css/submitted/masking/mask-size-length-length.html
index 9ef76bcd6625..f9cf2cb6bcb9 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-length-length.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-length-length.html
@@ -22,6 +22,7 @@
         background-color: purple;
         mask-image: url(support/50x100-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-size: 32px 64px;
       }
     </style>
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-length-percent.html b/layout/reftests/w3c-css/submitted/masking/mask-size-length-percent.html
index 592e593870cb..ba5bbbc55c50 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-length-percent.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-length-percent.html
@@ -22,6 +22,7 @@
         background-color: purple;
         mask-image: url(support/50x100-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-size: 16px 25%;
       }
     </style>
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-length.html b/layout/reftests/w3c-css/submitted/masking/mask-size-length.html
index 76563e3329f7..961357e12f7e 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-length.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-length.html
@@ -22,6 +22,7 @@
         background-color: purple;
         mask-image: url(support/50x100-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-size: 32px;
       }
     </style>
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-percent-auto.html b/layout/reftests/w3c-css/submitted/masking/mask-size-percent-auto.html
index d81cbcc02b90..603346d6e6b9 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-percent-auto.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-percent-auto.html
@@ -22,6 +22,7 @@
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-size: 50% auto;
       }
     </style>
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-percent-length.html b/layout/reftests/w3c-css/submitted/masking/mask-size-percent-length.html
index 25c341b3d245..4ac9c8e81fdd 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-percent-length.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-percent-length.html
@@ -22,6 +22,7 @@
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-size: 50% 32px;
       }
     </style>
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-percent-percent-stretch.html b/layout/reftests/w3c-css/submitted/masking/mask-size-percent-percent-stretch.html
index 5309b379a5a0..69f89b8a984f 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-percent-percent-stretch.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-percent-percent-stretch.html
@@ -22,6 +22,7 @@
         background-color: purple;
         mask-image: url(support/transparent-100x50-blue-100x50.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-size: 100% 100%;
       }
     </style>
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-percent-percent.html b/layout/reftests/w3c-css/submitted/masking/mask-size-percent-percent.html
index d9138f75ad09..7b04d9b6d546 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-percent-percent.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-percent-percent.html
@@ -22,6 +22,7 @@
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-size: 50% 25%;
       }
     </style>
diff --git a/layout/reftests/w3c-css/submitted/masking/mask-size-percent.html b/layout/reftests/w3c-css/submitted/masking/mask-size-percent.html
index 4c0837b81541..2e056df5217b 100644
--- a/layout/reftests/w3c-css/submitted/masking/mask-size-percent.html
+++ b/layout/reftests/w3c-css/submitted/masking/mask-size-percent.html
@@ -22,6 +22,7 @@
         background-color: purple;
         mask-image: url(support/50x50-opaque-blue.svg);
         mask-repeat: no-repeat;
+        mask-position: left top;
         mask-size: 50%;
       }
     </style>
diff --git a/layout/reftests/w3c-css/submitted/masking/reftest.list b/layout/reftests/w3c-css/submitted/masking/reftest.list
index beb43d7e49b1..1a1ea0a4c1ac 100644
--- a/layout/reftests/w3c-css/submitted/masking/reftest.list
+++ b/layout/reftests/w3c-css/submitted/masking/reftest.list
@@ -1,81 +1,79 @@
-# All mask properties test cases are meant to be failed
-# until bug 1251161 is fixed, which means enabling mask shorthand.
-# To enable it in compile time, refer to bug 1243734
+# For those test items with failure type fuzzy-if added, please refer to bug 1231643#c10.
 
 # mask-composite test cases
-fails == mask-composite-1a.html mask-composite-1-ref.html
-fails == mask-composite-1b.html mask-composite-1-ref.html
-fails == mask-composite-1c.html mask-composite-1-ref.html
-fails == mask-composite-2a.html mask-composite-2-ref.html
-fails == mask-composite-2b.html mask-composite-2-ref.html
-fails == mask-composite-2c.html mask-composite-2-ref.html
+== mask-composite-1a.html mask-composite-1-ref.html
+fuzzy-if(skiaContent,64,200) == mask-composite-1b.html mask-composite-1-ref.html
+== mask-composite-1c.html mask-composite-1-ref.html
+fuzzy-if(skiaContent||winWidget,1,5000) == mask-composite-2a.html mask-composite-2-ref.html
+fuzzy-if(skiaContent||winWidget,64,5200) == mask-composite-2b.html mask-composite-2-ref.html
+== mask-composite-2c.html mask-composite-2-ref.html
 
 # mask-mode test cases
-fails == mask-mode-a.html mask-mode-ref.html
-fails == mask-mode-b.html mask-mode-ref.html
-fails == mask-mode-to-mask-type.html mask-mode-to-mask-type-ref.html
+fuzzy-if(skiaContent,1,30000) == mask-mode-a.html mask-mode-ref.html
+fuzzy-if(skiaContent,1,30000) == mask-mode-b.html mask-mode-ref.html
+fuzzy-if(skiaContent,1,30000) == mask-mode-to-mask-type.html mask-mode-to-mask-type-ref.html
 
 # mask-image test cases
-fails == mask-image-1a.html mask-image-1-ref.html
-fails == mask-image-1b.html mask-image-1-ref.html
-fails == mask-image-1c.html mask-image-1-ref.html
+== mask-image-1a.html mask-image-1-ref.html
+== mask-image-1b.html mask-image-1-ref.html
+== mask-image-1c.html mask-image-1-ref.html
 == mask-image-1d.html mask-image-1-ref.html
-fails == mask-image-2.html mask-image-2-ref.html
-fails == mask-image-3a.html mask-image-3-ref.html
-fails == mask-image-3b.html mask-image-3-ref.html
-fails == mask-image-3c.html mask-image-3-ref.html
-fails == mask-image-3d.html mask-image-3-ref.html
-fails == mask-image-3e.html mask-image-3-ref.html
-fails == mask-image-3f.html mask-image-3-ref.html
-fails == mask-image-3g.html mask-image-3-ref.html
-fails == mask-image-4a.html blank.html
-fails == mask-image-4b.html blank.html
+fuzzy-if(skiaContent||winWidget,1,20000) == mask-image-2.html mask-image-2-ref.html
+== mask-image-3a.html mask-image-3-ref.html
+== mask-image-3b.html mask-image-3-ref.html
+fuzzy-if(skiaContent||winWidget,1,43) == mask-image-3c.html mask-image-3-ref.html
+fuzzy-if(skiaContent||winWidget,1,43) == mask-image-3d.html mask-image-3-ref.html
+== mask-image-3e.html mask-image-3-ref.html
+fuzzy-if(skiaContent,50,50) == mask-image-3f.html mask-image-3-ref.html
+== mask-image-3g.html mask-image-3-ref.html
+== mask-image-4a.html blank.html
+== mask-image-4b.html blank.html
 == mask-image-5.html mask-image-5-ref.html
 
 # mask-clip test cases
-fails == mask-clip-1.html mask-clip-1-ref.html
+== mask-clip-1.html mask-clip-1-ref.html
 
 # mask-position test cases
-fails == mask-position-1a.html mask-position-1-ref.html
-fails == mask-position-1b.html mask-position-1-ref.html
-fails == mask-position-1c.html mask-position-1-ref.html
-fails == mask-position-2a.html mask-position-2-ref.html
-fails == mask-position-2b.html mask-position-2-ref.html
-fails == mask-position-3a.html mask-position-3-ref.html
-fails == mask-position-3b.html mask-position-3-ref.html
-fails == mask-position-4a.html mask-position-4-ref.html
-fails == mask-position-4b.html mask-position-4-ref.html
-fails == mask-position-4c.html mask-position-4-ref.html
-fails == mask-position-4d.html mask-position-4-ref.html
-fails == mask-position-5.html mask-position-5-ref.html
-fails == mask-position-6.html mask-position-6-ref.html
-fails == mask-position-7.html mask-position-7-ref.html
+== mask-position-1a.html mask-position-1-ref.html
+== mask-position-1b.html mask-position-1-ref.html
+== mask-position-1c.html mask-position-1-ref.html
+== mask-position-2a.html mask-position-2-ref.html
+== mask-position-2b.html mask-position-2-ref.html
+== mask-position-3a.html mask-position-3-ref.html
+== mask-position-3b.html mask-position-3-ref.html
+== mask-position-4a.html mask-position-4-ref.html
+== mask-position-4b.html mask-position-4-ref.html
+== mask-position-4c.html mask-position-4-ref.html
+== mask-position-4d.html mask-position-4-ref.html
+== mask-position-5.html mask-position-5-ref.html
+== mask-position-6.html mask-position-6-ref.html
+== mask-position-7.html mask-position-7-ref.html
 
 # mask-repeat test cases
-fails == mask-repeat-1.html mask-repeat-1-ref.html # bug 1258623
-fails == mask-repeat-2.html mask-repeat-2-ref.html # bug 1258626
-fails == mask-repeat-3.html mask-repeat-3-ref.html # bug 1258626
+== mask-repeat-1.html mask-repeat-1-ref.html
+== mask-repeat-2.html mask-repeat-2-ref.html
+== mask-repeat-3.html mask-repeat-3-ref.html
 
 # mask-origin test cases
-fails == mask-origin-1.html mask-origin-1-ref.html # bug 1258286
+== mask-origin-1.html mask-origin-1-ref.html
 fails == mask-origin-2.html mask-origin-2-ref.html # bug 1260094
 
 # mask-size test cases
-fails == mask-size-auto.html mask-size-auto-ref.html
-fails == mask-size-auto-auto.html mask-size-auto-ref.html
-fails == mask-size-auto-length.html mask-size-auto-length-ref.html
-fails == mask-size-auto-percent.html mask-size-auto-length-ref.html
-fails == mask-size-contain-clip-border.html mask-size-contain-clip-border-ref.html
-fails == mask-size-contain-clip-padding.html mask-size-contain-clip-padding-ref.html
-fails == mask-size-contain-position-fifty-fifty.html mask-size-contain-position-fifty-fifty-ref.html
-fails == mask-size-contain.html mask-size-contain-ref.html
-fails == mask-size-cover.html mask-size-cover-ref.html
-fails == mask-size-length.html mask-size-length-length-ref.html
-fails == mask-size-length-auto.html mask-size-length-length-ref.html
-fails == mask-size-length-length.html mask-size-length-length-ref.html
-fails == mask-size-length-percent.html mask-size-length-percent-ref.html
-fails == mask-size-percent.html mask-size-percent-percent-ref.html
-fails == mask-size-percent-auto.html mask-size-percent-percent-ref.html
-fails == mask-size-percent-length.html mask-size-percent-percent-ref.html
-fails == mask-size-percent-percent.html mask-size-percent-percent-ref.html
-fails == mask-size-percent-percent-stretch.html mask-size-percent-percent-stretch-ref.html
+== mask-size-auto.html mask-size-auto-ref.html
+== mask-size-auto-auto.html mask-size-auto-ref.html
+== mask-size-auto-length.html mask-size-auto-length-ref.html
+== mask-size-auto-percent.html mask-size-auto-length-ref.html
+== mask-size-contain-clip-border.html mask-size-contain-clip-border-ref.html
+== mask-size-contain-clip-padding.html mask-size-contain-clip-padding-ref.html
+== mask-size-contain-position-fifty-fifty.html mask-size-contain-position-fifty-fifty-ref.html
+== mask-size-contain.html mask-size-contain-ref.html
+== mask-size-cover.html mask-size-cover-ref.html
+== mask-size-length.html mask-size-length-length-ref.html
+== mask-size-length-auto.html mask-size-length-length-ref.html
+== mask-size-length-length.html mask-size-length-length-ref.html
+== mask-size-length-percent.html mask-size-length-percent-ref.html
+== mask-size-percent.html mask-size-percent-percent-ref.html
+== mask-size-percent-auto.html mask-size-percent-percent-ref.html
+== mask-size-percent-length.html mask-size-percent-percent-ref.html
+== mask-size-percent-percent.html mask-size-percent-percent-ref.html
+== mask-size-percent-percent-stretch.html mask-size-percent-percent-stretch-ref.html