diff --git a/layout/reftests/svg/smil/syncbase/sandwich-priority-1.svg b/layout/reftests/svg/smil/syncbase/sandwich-priority-1.svg
index a1cbdad1ead4..abe1e67c3388 100644
--- a/layout/reftests/svg/smil/syncbase/sandwich-priority-1.svg
+++ b/layout/reftests/svg/smil/syncbase/sandwich-priority-1.svg
@@ -12,6 +12,6 @@
    -->
   <rect width="100" height="100" fill="orange">
     <set attributeName="fill" to="green" begin="a.begin"/>
-    <set attributeName="fill" id="a" to="red" begin="0s"/>
+    <set attributeName="fill" to="red"   begin="0s" id="a"/>
   </rect>
 </svg>
diff --git a/layout/reftests/svg/smil/syncbase/sandwich-priority-10.svg b/layout/reftests/svg/smil/syncbase/sandwich-priority-10.svg
index d1d0f59475b9..0732c695f574 100644
--- a/layout/reftests/svg/smil/syncbase/sandwich-priority-10.svg
+++ b/layout/reftests/svg/smil/syncbase/sandwich-priority-10.svg
@@ -19,8 +19,8 @@
     priority.
    -->
   <rect width="100" height="100" fill="orange">
-    <set attributeName="fill" to="green" begin="b.end" id="c"/>
+    <set attributeName="fill" to="green"  begin="b.end"       id="c"/>
     <set attributeName="fill" to="orange" begin="0s" end="1s" id="b"/>
-    <set attributeName="fill" to="red" begin="1s" id="a"/>
+    <set attributeName="fill" to="red"    begin="1s"          id="a"/>
   </rect>
 </svg>
diff --git a/layout/reftests/svg/smil/syncbase/sandwich-priority-11.svg b/layout/reftests/svg/smil/syncbase/sandwich-priority-11.svg
index 3ba4386f6517..7f96942c43c5 100644
--- a/layout/reftests/svg/smil/syncbase/sandwich-priority-11.svg
+++ b/layout/reftests/svg/smil/syncbase/sandwich-priority-11.svg
@@ -11,7 +11,7 @@
   <rect width="100" height="100" fill="orange">
     <set attributeName="fill" to="green" begin="a.begin" dur="1s"
       fill="freeze"/>
-    <set attributeName="fill" id="a" to="red" begin="0s; 3s" dur="1s"
+    <set attributeName="fill" to="red"   begin="0s; 3s"  dur="1s" id="a"
       fill="freeze"/>
   </rect>
 </svg>
diff --git a/layout/reftests/svg/smil/syncbase/sandwich-priority-2.svg b/layout/reftests/svg/smil/syncbase/sandwich-priority-2.svg
index 4a72ec6e9336..3d6d458f5070 100644
--- a/layout/reftests/svg/smil/syncbase/sandwich-priority-2.svg
+++ b/layout/reftests/svg/smil/syncbase/sandwich-priority-2.svg
@@ -9,10 +9,10 @@
     A longer chain.
    -->
   <rect width="100" height="100" fill="orange">
-    <set attributeName="fill" id="b" to="blue" begin="a.begin-0.5s"/>
+    <set attributeName="fill" to="blue"  begin="a.begin-0.5s" id="b"/>
     <set attributeName="fill" to="green" begin="d.begin"/>
-    <set attributeName="fill" id="d" to="black" begin="c.begin-0.5s"/>
-    <set attributeName="x" id="c" to="0" begin="b.begin+1s"/>
-    <set attributeName="fill" id="a" to="red" begin="1s"/>
+    <set attributeName="fill" to="black" begin="c.begin-0.5s" id="d"/>
+    <set attributeName="x"    to="0"     begin="b.begin+1s"   id="c"/>
+    <set attributeName="fill" to="red"   begin="1s"           id="a"/>
   </rect>
 </svg>
diff --git a/layout/reftests/svg/smil/syncbase/sandwich-priority-3.svg b/layout/reftests/svg/smil/syncbase/sandwich-priority-3.svg
index 5050f2b14f2a..c566d8cd43c2 100644
--- a/layout/reftests/svg/smil/syncbase/sandwich-priority-3.svg
+++ b/layout/reftests/svg/smil/syncbase/sandwich-priority-3.svg
@@ -13,8 +13,8 @@
     'a's end time and so shouldn't be given the higher priority.
    -->
   <rect width="100" height="100" fill="orange">
-    <set attributeName="fill" id="c" to="red" begin="b.begin-1s"/>
-    <set attributeName="x" id="b" to="0" begin="a.end-1s"/>
-    <set attributeName="fill" id="a" to="green" begin="1s" dur="2s"/>
+    <set attributeName="fill" to="red"   begin="b.begin-1s"  id="c"/>
+    <set attributeName="x"    to="0"     begin="a.end-1s"    id="b"/>
+    <set attributeName="fill" to="green" begin="1s" dur="2s" id="a"/>
   </rect>
 </svg>
diff --git a/layout/reftests/svg/smil/syncbase/sandwich-priority-4.svg b/layout/reftests/svg/smil/syncbase/sandwich-priority-4.svg
index ce54ab6e8266..7ce158672af2 100644
--- a/layout/reftests/svg/smil/syncbase/sandwich-priority-4.svg
+++ b/layout/reftests/svg/smil/syncbase/sandwich-priority-4.svg
@@ -10,6 +10,6 @@
    -->
   <rect width="100" height="100" fill="orange">
     <set attributeName="fill" id="b" to="green" begin="a.begin"/>
-    <set attributeName="fill" id="a" to="red" begin="0s; b.begin"/>
+    <set attributeName="fill" id="a" to="red"   begin="0s; b.begin"/>
   </rect>
 </svg>
diff --git a/layout/reftests/svg/smil/syncbase/sandwich-priority-5.svg b/layout/reftests/svg/smil/syncbase/sandwich-priority-5.svg
index a45da2dcb155..05d82ffdf13d 100644
--- a/layout/reftests/svg/smil/syncbase/sandwich-priority-5.svg
+++ b/layout/reftests/svg/smil/syncbase/sandwich-priority-5.svg
@@ -14,8 +14,7 @@
    -->
   <rect width="100" height="100" fill="purple">
     <set attributeName="fill" id="c" to="orange" begin="a.begin; b.begin"/>
-    <set attributeName="fill" id="b" to="green"
-      begin="c.begin; b.begin"/>
-    <set attributeName="fill" id="a" to="red" begin="1s; b.begin; c.begin"/>
+    <set attributeName="fill" id="b" to="green"  begin="c.begin; b.begin"/>
+    <set attributeName="fill" id="a" to="red"    begin="1s; b.begin; c.begin"/>
   </rect>
 </svg>
diff --git a/layout/reftests/svg/smil/syncbase/sandwich-priority-6.svg b/layout/reftests/svg/smil/syncbase/sandwich-priority-6.svg
index 2545a04dedc1..a27b81dfab5e 100644
--- a/layout/reftests/svg/smil/syncbase/sandwich-priority-6.svg
+++ b/layout/reftests/svg/smil/syncbase/sandwich-priority-6.svg
@@ -11,7 +11,7 @@
   <rect width="100" height="100" fill="orange">
     <set attributeName="fill" to="green" begin="a.begin"
       dur="1s" fill="freeze"/>
-    <set attributeName="fill" id="a" to="red" begin="0s"
+    <set attributeName="fill" to="red"   begin="0s" id="a"
       dur="1s" fill="freeze"/>
   </rect>
 </svg>
diff --git a/layout/reftests/svg/smil/syncbase/sandwich-priority-7.svg b/layout/reftests/svg/smil/syncbase/sandwich-priority-7.svg
index 9a9090f5e041..db72072a752b 100644
--- a/layout/reftests/svg/smil/syncbase/sandwich-priority-7.svg
+++ b/layout/reftests/svg/smil/syncbase/sandwich-priority-7.svg
@@ -19,9 +19,9 @@
     but it's not.
    -->
   <rect width="100" height="100" fill="orange">
-    <set attributeName="fill" to="yellow" begin="1s" dur="2s" id="a"/>
+    <set attributeName="fill" to="yellow" begin="1s"      dur="2s" id="a"/>
     <set attributeName="fill" to="purple" begin="a.begin" dur="2s" id="b"/>
-    <set attributeName="fill" to="red" begin="b.begin" dur="2s" id="c"/>
-    <set attributeName="fill" to="green" begin="a.begin" dur="2s" id="d"/>
+    <set attributeName="fill" to="red"    begin="b.begin" dur="2s" id="c"/>
+    <set attributeName="fill" to="green"  begin="a.begin" dur="2s" id="d"/>
   </rect>
 </svg>
diff --git a/layout/reftests/svg/smil/syncbase/sandwich-priority-8.svg b/layout/reftests/svg/smil/syncbase/sandwich-priority-8.svg
index 9ff2588fb7f6..338d49e8764b 100644
--- a/layout/reftests/svg/smil/syncbase/sandwich-priority-8.svg
+++ b/layout/reftests/svg/smil/syncbase/sandwich-priority-8.svg
@@ -20,6 +20,6 @@
    -->
   <rect width="100" height="100" fill="orange">
     <set attributeName="fill" to="green" begin="1s" id="b"/>
-    <set attributeName="fill" to="red" begin="1s" id="a"/>
+    <set attributeName="fill" to="red"   begin="1s" id="a"/>
   </rect>
 </svg>
diff --git a/layout/reftests/svg/smil/syncbase/sandwich-priority-9.svg b/layout/reftests/svg/smil/syncbase/sandwich-priority-9.svg
index 42417c028932..d8ec1709cd6d 100644
--- a/layout/reftests/svg/smil/syncbase/sandwich-priority-9.svg
+++ b/layout/reftests/svg/smil/syncbase/sandwich-priority-9.svg
@@ -14,8 +14,8 @@
     dependent elements.
    -->
   <rect width="100" height="100" fill="orange">
-    <set attributeName="fill" to="yellow" begin="1s" id="b"/>
-    <set attributeName="fill" to="green" begin="b.begin" id="c"/>
-    <set attributeName="fill" to="red" begin="1s" id="a"/>
+    <set attributeName="fill" to="yellow" begin="1s"      id="b"/>
+    <set attributeName="fill" to="green"  begin="b.begin" id="c"/>
+    <set attributeName="fill" to="red"    begin="1s"      id="a"/>
   </rect>
 </svg>