diff --git a/content/base/src/nsStyledElement.cpp b/content/base/src/nsStyledElement.cpp
index 8992b9f660f..c76a6e6a55f 100644
--- a/content/base/src/nsStyledElement.cpp
+++ b/content/base/src/nsStyledElement.cpp
@@ -191,7 +191,7 @@ nsStyledElementNotElementCSSInlineStyle::GetInlineStyleRule()
 // Others and helpers
 
 nsICSSDeclaration*
-nsStyledElementNotElementCSSInlineStyle::GetStyle(nsresult* retval)
+nsStyledElementNotElementCSSInlineStyle::Style()
 {
   Element::nsDOMSlots *slots = DOMSlots();
 
@@ -203,7 +203,6 @@ nsStyledElementNotElementCSSInlineStyle::GetStyle(nsresult* retval)
     SetMayHaveStyle();
   }
 
-  *retval = NS_OK;
   return slots->mStyle;
 }
 
diff --git a/content/base/src/nsStyledElement.h b/content/base/src/nsStyledElement.h
index cf0d2b7aa78..9806a52fa31 100644
--- a/content/base/src/nsStyledElement.h
+++ b/content/base/src/nsStyledElement.h
@@ -50,7 +50,7 @@ public:
   virtual nsresult AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aAttribute,
                                 const nsAttrValue* aValue, bool aNotify);
 
-  nsICSSDeclaration* GetStyle(nsresult* retval);
+  nsICSSDeclaration* Style();
 
 protected:
 
diff --git a/content/html/content/src/nsGenericHTMLElement.cpp b/content/html/content/src/nsGenericHTMLElement.cpp
index 1106d1ec072..f94a4821375 100644
--- a/content/html/content/src/nsGenericHTMLElement.cpp
+++ b/content/html/content/src/nsGenericHTMLElement.cpp
@@ -233,9 +233,8 @@ class nsGenericHTMLElementTearoff : public nsIDOMElementCSSInlineStyle
 
   NS_IMETHOD GetStyle(nsIDOMCSSStyleDeclaration** aStyle)
   {
-    mozilla::ErrorResult rv;
-    NS_IF_ADDREF(*aStyle = mElement->GetStyle(rv));
-    return rv.ErrorCode();
+    NS_ADDREF(*aStyle = mElement->Style());
+    return NS_OK;
   }
 
   NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsGenericHTMLElementTearoff,
diff --git a/content/html/content/src/nsGenericHTMLElement.h b/content/html/content/src/nsGenericHTMLElement.h
index ae08966c068..5ff1bde4a4b 100644
--- a/content/html/content/src/nsGenericHTMLElement.h
+++ b/content/html/content/src/nsGenericHTMLElement.h
@@ -229,15 +229,6 @@ public:
                             : NS_LITERAL_STRING("false"),
                 aError);
   }
-  nsICSSDeclaration* GetStyle(mozilla::ErrorResult& aError)
-  {
-    nsresult rv;
-    nsICSSDeclaration* style = nsMappedAttributeElement::GetStyle(&rv);
-    if (NS_FAILED(rv)) {
-      aError.Throw(rv);
-    }
-    return style;
-  }
 
   /**
    * Determine whether an attribute is an event (onclick, etc.)
diff --git a/content/svg/content/src/nsSVGElement.cpp b/content/svg/content/src/nsSVGElement.cpp
index 58524d1bfcf..53c85747aa9 100644
--- a/content/svg/content/src/nsSVGElement.cpp
+++ b/content/svg/content/src/nsSVGElement.cpp
@@ -102,22 +102,8 @@ nsSVGElement::GetClassName(nsIDOMSVGAnimatedString** aClassName)
 NS_IMETHODIMP
 nsSVGElement::GetStyle(nsIDOMCSSStyleDeclaration** aStyle)
 {
-  ErrorResult rv;
-  NS_ADDREF(*aStyle = GetStyle(rv));
-  return rv.ErrorCode();
-}
-
-nsICSSDeclaration*
-nsSVGElement::GetStyle(ErrorResult& rv)
-{
-  nsresult res;
-  nsICSSDeclaration* style = nsSVGElementBase::GetStyle(&res);
-  if (NS_FAILED(res)) {
-    rv.Throw(res);
-    return nullptr;
-  }
-
-  return style;
+  NS_ADDREF(*aStyle = Style());
+  return NS_OK;
 }
 
 //----------------------------------------------------------------------
diff --git a/content/svg/content/src/nsSVGElement.h b/content/svg/content/src/nsSVGElement.h
index 48759fc8ae9..c96a890bdd6 100644
--- a/content/svg/content/src/nsSVGElement.h
+++ b/content/svg/content/src/nsSVGElement.h
@@ -301,7 +301,6 @@ public:
   mozilla::dom::SVGSVGElement* GetOwnerSVGElement(mozilla::ErrorResult& rv);
   nsSVGElement* GetViewportElement();
   already_AddRefed<nsIDOMSVGAnimatedString> ClassName();
-  nsICSSDeclaration* GetStyle(mozilla::ErrorResult& rv);
   already_AddRefed<mozilla::dom::CSSValue> GetPresentationAttribute(const nsAString& aName, mozilla::ErrorResult& rv);
 protected:
   virtual JSObject* WrapNode(JSContext *cx, JSObject *scope, bool *triedToWrap);
diff --git a/content/xul/content/src/nsXULElement.cpp b/content/xul/content/src/nsXULElement.cpp
index c87be6820af..49d33f06320 100644
--- a/content/xul/content/src/nsXULElement.cpp
+++ b/content/xul/content/src/nsXULElement.cpp
@@ -136,10 +136,8 @@ public:
 
   NS_IMETHOD GetStyle(nsIDOMCSSStyleDeclaration** aStyle)
   {
-    nsresult rv;
-    *aStyle = static_cast<nsXULElement*>(mElement.get())->GetStyle(&rv);
-    NS_ENSURE_SUCCESS(rv, rv);
-    NS_ADDREF(*aStyle);
+    nsXULElement* element = static_cast<nsXULElement*>(mElement.get());
+    NS_ADDREF(*aStyle = element->Style());
     return NS_OK;
   }
   NS_FORWARD_NSIFRAMELOADEROWNER(static_cast<nsXULElement*>(mElement.get())->)
diff --git a/dom/webidl/HTMLElement.webidl b/dom/webidl/HTMLElement.webidl
index 1d581de29f2..72d89505245 100644
--- a/dom/webidl/HTMLElement.webidl
+++ b/dom/webidl/HTMLElement.webidl
@@ -73,7 +73,7 @@ interface HTMLElement : Element {
   //readonly attribute boolean? commandChecked;
 
   // styling
-  [Throws, Constant]
+  [Constant]
   readonly attribute CSSStyleDeclaration style;
 
   // event handler IDL attributes
diff --git a/dom/webidl/SVGElement.webidl b/dom/webidl/SVGElement.webidl
index 550a3e771a7..e5d7f2fd795 100644
--- a/dom/webidl/SVGElement.webidl
+++ b/dom/webidl/SVGElement.webidl
@@ -18,7 +18,6 @@ interface SVGElement : Element {
            attribute DOMString xmlbase; */
 
   readonly attribute SVGAnimatedString className;
-  [Throws]
   readonly attribute CSSStyleDeclaration style;
 
   // The CSSValue interface has been deprecated by the CSS WG.
diff --git a/js/xpconnect/src/dom_quickstubs.qsconf b/js/xpconnect/src/dom_quickstubs.qsconf
index 73451a53440..00d995fa8f5 100644
--- a/js/xpconnect/src/dom_quickstubs.qsconf
+++ b/js/xpconnect/src/dom_quickstubs.qsconf
@@ -360,8 +360,8 @@ customMethodCalls = {
                 '       don\'t actually implement GetStyle. */\n'
                 '    if (self->GetNameSpaceID() == kNameSpaceID_MathML)\n'
                 '      return xpc_qsThrow(cx, NS_ERROR_XPC_BAD_CONVERT_JS);\n'
-                '    nsIDOMCSSStyleDeclaration* result = '
-                'self->GetStyle(&rv);'
+                '    nsIDOMCSSStyleDeclaration* result = self->Style();',
+        'canFail': False
         },
     'nsIDOMWindow_GetOnmouseenter' : {
         'thisType' : 'nsIDOMWindow',