--- a/dom/svg/SVGAnimatedPreserveAspectRatio.cpp
+++ b/dom/svg/SVGAnimatedPreserveAspectRatio.cpp
@@ -141,26 +141,17 @@ ToPreserveAspectRatio(const nsAString &a
       !tokenizer.hasMoreTokens()) {
     return NS_ERROR_DOM_SYNTAX_ERR;
   }
   const nsAString &token = tokenizer.nextToken();
 
   nsresult rv;
   SVGPreserveAspectRatio val;
 
-  val.SetDefer(token.EqualsLiteral("defer"));
-
-  if (val.GetDefer()) {
-    if (!tokenizer.hasMoreTokens()) {
-      return NS_ERROR_DOM_SYNTAX_ERR;
-    }
-    rv = val.SetAlign(GetAlignForString(tokenizer.nextToken()));
-  } else {
-    rv = val.SetAlign(GetAlignForString(token));
-  }
+  rv = val.SetAlign(GetAlignForString(token));
 
   if (NS_FAILED(rv)) {
     return NS_ERROR_DOM_SYNTAX_ERR;
   }
 
   if (tokenizer.hasMoreTokens()) {
     rv = val.SetMeetOrSlice(GetMeetOrSliceForString(tokenizer.nextToken()));
     if (NS_FAILED(rv)) {
@@ -211,20 +202,16 @@ SVGAnimatedPreserveAspectRatio::SetBaseV
 void
 SVGAnimatedPreserveAspectRatio::GetBaseValueString(
   nsAString& aValueAsString) const
 {
   nsAutoString tmpString;
 
   aValueAsString.Truncate();
 
-  if (mBaseVal.mDefer) {
-    aValueAsString.AppendLiteral("defer ");
-  }
-
   GetAlignString(tmpString, mBaseVal.mAlign);
   aValueAsString.Append(tmpString);
 
   if (mBaseVal.mAlign != uint8_t(SVG_PRESERVEASPECTRATIO_NONE)) {
 
     aValueAsString.Append(' ');
     GetMeetOrSliceString(tmpString, mBaseVal.mMeetOrSlice);
     aValueAsString.Append(tmpString);

new file mode 100644
--- /dev/null
+++ b/layout/reftests/svg/as-image/defer-unsupported-1-helper.svg
@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100"
+     viewBox="0 0 50 50" preserveAspectRatio="xMaxYMax">
+
+  <rect width="100" height="100" fill="lime"/>
+</svg>

new file mode 100644
--- /dev/null
+++ b/layout/reftests/svg/as-image/defer-unsupported-1-ref.svg
@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink">
+
+  <rect width="100" height="100" fill="blue"/>
+  <image xlink:href="defer-unsupported-1-helper.svg" width="200" height="100"/>
+</svg>

new file mode 100644
--- /dev/null
+++ b/layout/reftests/svg/as-image/defer-unsupported-1.svg
@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink">
+
+  <rect width="100" height="100" fill="blue"/>
+  <image xlink:href="defer-unsupported-1-helper.svg" width="200" height="100"
+         preserveAspectRatio="defer xMinYMin"/>
+</svg>

--- a/layout/reftests/svg/as-image/reftest.list
+++ b/layout/reftests/svg/as-image/reftest.list
@@ -235,8 +235,11 @@ skip-if(B2G||Mulet) fuzzy(2,1) == svg-bo
 != nonuniform-scale-2d.html?0.3&1.0  nonuniform-scale-2d.html?0.3&0.3
 != nonuniform-scale-2d.html?0.3&1.0  nonuniform-scale-2d.html?1.0&1.0
 != nonuniform-scale-2d.html?1.0&0.3  nonuniform-scale-2d.html?0.3&0.3
 != nonuniform-scale-2d.html?1.0&0.3  nonuniform-scale-2d.html?1.0&1.0
 != nonuniform-scale-3d.html?0.3&1.0&0.3  nonuniform-scale-3d.html?0.3&0.3&0.3
 != nonuniform-scale-3d.html?0.3&1.0&0.3  nonuniform-scale-3d.html?1.0&1.0&1.0
 != nonuniform-scale-3d.html?1.0&0.3&0.3  nonuniform-scale-3d.html?0.3&0.3&0.3
 != nonuniform-scale-3d.html?1.0&0.3&0.3  nonuniform-scale-3d.html?1.0&1.0&1.0
+
+# Test for preserveAspectRatio with no-longer-supported "defer" keyword
+== defer-unsupported-1.svg  defer-unsupported-1-ref.svg