diff --git a/components/script/dom/characterdata.rs b/components/script/dom/characterdata.rs
index df173ff1787..f10516c5278 100644
--- a/components/script/dom/characterdata.rs
+++ b/components/script/dom/characterdata.rs
@@ -78,9 +78,8 @@ impl<'a> CharacterDataMethods for JSRef<'a, CharacterData> {
     }
 
     // https://dom.spec.whatwg.org/#dom-characterdata-data
-    fn SetData(self, arg: DOMString) -> ErrorResult {
-        *self.data.borrow_mut() = arg;
-        Ok(())
+    fn SetData(self, data: DOMString) {
+        *self.data.borrow_mut() = data;
     }
 
     // https://dom.spec.whatwg.org/#dom-characterdata-length
@@ -98,9 +97,8 @@ impl<'a> CharacterDataMethods for JSRef<'a, CharacterData> {
     }
 
     // https://dom.spec.whatwg.org/#dom-characterdata-appenddata
-    fn AppendData(self, arg: DOMString) -> ErrorResult {
-        self.data.borrow_mut().push_str(arg.as_slice());
-        Ok(())
+    fn AppendData(self, data: DOMString) {
+        self.data.borrow_mut().push_str(&data);
     }
 
     // https://dom.spec.whatwg.org/#dom-characterdata-insertdata
diff --git a/components/script/dom/webidls/CharacterData.webidl b/components/script/dom/webidls/CharacterData.webidl
index 39f304e0e39..e758adb4d30 100644
--- a/components/script/dom/webidls/CharacterData.webidl
+++ b/components/script/dom/webidls/CharacterData.webidl
@@ -11,11 +11,10 @@
  */
 
 interface CharacterData : Node {
-  [TreatNullAs=EmptyString,SetterThrows] attribute DOMString data;
+  [TreatNullAs=EmptyString] attribute DOMString data;
   readonly attribute unsigned long length;
   [Throws]
   DOMString substringData(unsigned long offset, unsigned long count);
-  [Throws]
   void appendData(DOMString data);
   [Throws]
   void insertData(unsigned long offset, DOMString data);