Backed out changeset 18ff1472dae9 (bug 1312742) for not updating the expected results of wpt test /html/dom/reflection-embedded.html and more. r=backout

dom/html/HTMLAnchorElement.cpp

@@ -347,11 +347,10 @@ HTMLAnchorElement::ToString(nsAString& aSource)
   return GetHref(aSource);
 }
 
-NS_IMETHODIMP
+NS_IMETHODIMP    
 HTMLAnchorElement::GetPing(nsAString& aValue)
 {
-  GetAttr(kNameSpaceID_None, nsGkAtoms::ping, aValue);
-  return NS_OK;
+  return GetURIListAttr(nsGkAtoms::ping, aValue);
 }
 
 NS_IMETHODIMP

dom/html/HTMLAreaElement.cpp

@@ -221,11 +221,10 @@ HTMLAreaElement::ToString(nsAString& aSource)
   return GetHref(aSource);
 }
 
-NS_IMETHODIMP
+NS_IMETHODIMP    
 HTMLAreaElement::GetPing(nsAString& aValue)
 {
-  GetAttr(kNameSpaceID_None, nsGkAtoms::ping, aValue);
-  return NS_OK;
+  return GetURIListAttr(nsGkAtoms::ping, aValue);
 }
 
 NS_IMETHODIMP

dom/html/nsGenericHTMLElement.cpp

@@ -1679,6 +1679,68 @@ nsGenericHTMLElement::IsScrollGrabAllowed(JSContext*, JSObject*)
   return nsContentUtils::IsSystemPrincipal(prin);
 }
 
+nsresult
+nsGenericHTMLElement::GetURIListAttr(nsIAtom* aAttr, nsAString& aResult)
+{
+  aResult.Truncate();
+
+  nsAutoString value;
+  if (!GetAttr(kNameSpaceID_None, aAttr, value))
+    return NS_OK;
+
+  nsIDocument* doc = OwnerDoc(); 
+  nsCOMPtr<nsIURI> baseURI = GetBaseURI();
+
+  nsString::const_iterator end;
+  value.EndReading(end);
+
+  nsAString::const_iterator iter;
+  value.BeginReading(iter);
+
+  while (iter != end) {
+    while (*iter == ' ' && iter != end) {
+      ++iter;
+    }
+
+    if (iter == end) {
+      break;
+    }
+
+    nsAString::const_iterator start = iter;
+
+    while (iter != end && *iter != ' ') {
+      ++iter;
+    }
+
+    if (!aResult.IsEmpty()) {
+      aResult.Append(NS_LITERAL_STRING(" "));
+    }
+
+    const nsSubstring& uriPart = Substring(start, iter);
+    nsCOMPtr<nsIURI> attrURI;
+    nsresult rv =
+      nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(attrURI),
+                                                uriPart, doc, baseURI);
+    if (NS_FAILED(rv)) {
+      aResult.Append(uriPart);
+      continue;
+    }
+
+    MOZ_ASSERT(attrURI);
+
+    nsAutoCString spec;
+    rv = attrURI->GetSpec(spec);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      aResult.Append(uriPart);
+      continue;
+    }
+
+    AppendUTF8toUTF16(spec, aResult);
+  }
+
+  return NS_OK;
+}
+
 HTMLMenuElement*
 nsGenericHTMLElement::GetContextMenu() const
 {

dom/html/nsGenericHTMLElement.h

@@ -1062,6 +1062,20 @@ protected:
     SetHTMLAttr(aAttr, value, aRv);
   }
 
+  /**
+   * This method works like GetURIAttr, except that it supports multiple
+   * URIs separated by whitespace (one or more U+0020 SPACE characters).
+   *
+   * Gets the absolute URI values of an attribute, by resolving any relative
+   * URIs in the attribute against the baseuri of the element. If a substring
+   * isn't a relative URI, the substring is returned as is. Only works for
+   * attributes in null namespace.
+   *
+   * @param aAttr    name of attribute.
+   * @param aResult  result value [out]
+   */
+  nsresult GetURIListAttr(nsIAtom* aAttr, nsAString& aResult);
+
   /**
    * Locates the nsIEditor associated with this node.  In general this is
    * equivalent to GetEditorInternal(), but for designmode or contenteditable,