1 files changed, 14 insertions, 0 deletions
diff --git a/dom/base/nsAttrValueOrString.h b/dom/base/nsAttrValueOrString.h
index 8e6c069532..1a62a84287 100644
--- a/dom/base/nsAttrValueOrString.h
+++ b/dom/base/nsAttrValueOrString.h
@@ -78,6 +78,20 @@ public:
     return aOther.EqualsAsStrings(*mAttrValue);
   }
 
+  /*
+   * Returns true if the value stored is empty
+   */
+  bool IsEmpty() const
+  {
+    if (mStringPtr) {
+      return mStringPtr->IsEmpty();
+    }
+    if (mAttrValue) {
+      return mAttrValue->IsEmptyString();
+    }
+    return true;
+  }
+
 protected:
   const nsAttrValue*       mAttrValue;
   mutable const nsAString* mStringPtr;