diff -r 000000000000 -r 6474c204b198 parser/html/nsHtml5SVGLoadDispatcher.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/parser/html/nsHtml5SVGLoadDispatcher.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,40 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsHtml5SVGLoadDispatcher.h"
+#include "nsPresContext.h"
+#include "nsIPresShell.h"
+#include "mozilla/BasicEvents.h"
+#include "mozilla/EventDispatcher.h"
+#include "nsIDocument.h"
+
+using namespace mozilla;
+
+nsHtml5SVGLoadDispatcher::nsHtml5SVGLoadDispatcher(nsIContent* aElement)
+  : mElement(aElement)
+  , mDocument(mElement->OwnerDoc())
+{
+  mDocument->BlockOnload();
+}
+
+NS_IMETHODIMP
+nsHtml5SVGLoadDispatcher::Run()
+{
+  WidgetEvent event(true, NS_SVG_LOAD);
+  event.mFlags.mBubbles = false;
+  // Do we care about forcing presshell creation if it hasn't happened yet?
+  // That is, should this code flush or something?  Does it really matter?
+  // For that matter, do we really want to try getting the prescontext?
+  // Does this event ever want one?
+  nsRefPtr<nsPresContext> ctx;
+  nsCOMPtr<nsIPresShell> shell = mElement->OwnerDoc()->GetShell();
+  if (shell) {
+    ctx = shell->GetPresContext();
+  }
+  EventDispatcher::Dispatch(mElement, ctx, &event);
+  // Unblocking onload on the same document that it was blocked even if
+  // the element has moved between docs since blocking.
+  mDocument->UnblockOnload(false);
+  return NS_OK;
+}