diff --git a/content/html/style/src/nsCSSParser.cpp b/content/html/style/src/nsCSSParser.cpp
index f5f205b8315..e417ef5e2ca 100644
--- a/content/html/style/src/nsCSSParser.cpp
+++ b/content/html/style/src/nsCSSParser.cpp
@@ -2147,6 +2147,7 @@ PRBool CSSParserImpl::ParseProperty(PRInt32& aErrorCode,
   case PROP_TOP:
   case PROP_LEFT:
   case PROP_RIGHT:
+	  return ParseVariant(aErrorCode, aDeclaration, aPropID, VARIANT_AHLP, nsnull, parsed);
   case PROP_HEIGHT:
   case PROP_WIDTH:
     return ParsePositiveVariant(aErrorCode, aDeclaration, aPropID, VARIANT_AHLP, nsnull, parsed);
diff --git a/layout/html/style/src/nsCSSParser.cpp b/layout/html/style/src/nsCSSParser.cpp
index f5f205b8315..e417ef5e2ca 100644
--- a/layout/html/style/src/nsCSSParser.cpp
+++ b/layout/html/style/src/nsCSSParser.cpp
@@ -2147,6 +2147,7 @@ PRBool CSSParserImpl::ParseProperty(PRInt32& aErrorCode,
   case PROP_TOP:
   case PROP_LEFT:
   case PROP_RIGHT:
+	  return ParseVariant(aErrorCode, aDeclaration, aPropID, VARIANT_AHLP, nsnull, parsed);
   case PROP_HEIGHT:
   case PROP_WIDTH:
     return ParsePositiveVariant(aErrorCode, aDeclaration, aPropID, VARIANT_AHLP, nsnull, parsed);
diff --git a/layout/style/nsCSSParser.cpp b/layout/style/nsCSSParser.cpp
index f5f205b8315..e417ef5e2ca 100644
--- a/layout/style/nsCSSParser.cpp
+++ b/layout/style/nsCSSParser.cpp
@@ -2147,6 +2147,7 @@ PRBool CSSParserImpl::ParseProperty(PRInt32& aErrorCode,
   case PROP_TOP:
   case PROP_LEFT:
   case PROP_RIGHT:
+	  return ParseVariant(aErrorCode, aDeclaration, aPropID, VARIANT_AHLP, nsnull, parsed);
   case PROP_HEIGHT:
   case PROP_WIDTH:
     return ParsePositiveVariant(aErrorCode, aDeclaration, aPropID, VARIANT_AHLP, nsnull, parsed);