From 246edb5332e3d1415a4949a76e09ff951d5e497d Mon Sep 17 00:00:00 2001
From: wolfbeast <mcwerewolf@gmail.com>
Date: Wed, 5 Sep 2018 01:47:58 +0200
Subject: Part 3. Resolve local-ref in SVGUseElement::LookupHref by
 nsSVGEffects::GetBaseURLForLocalRef.

---
 dom/svg/SVGUseElement.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/dom/svg/SVGUseElement.cpp b/dom/svg/SVGUseElement.cpp
index 4911e2cac..9212ab1aa 100644
--- a/dom/svg/SVGUseElement.cpp
+++ b/dom/svg/SVGUseElement.cpp
@@ -15,6 +15,7 @@
 #include "mozilla/dom/Element.h"
 #include "nsContentUtils.h"
 #include "nsIURI.h"
+#include "nsSVGEffects.h"
 
 NS_IMPL_NS_NEW_NAMESPACED_SVG_ELEMENT(Use)
 
@@ -418,11 +419,15 @@ SVGUseElement::LookupHref()
     return;
   }
 
+  nsCOMPtr<nsIURI> originURI =
+    mOriginal ? mOriginal->GetBaseURI() : GetBaseURI();
+  nsCOMPtr<nsIURI> baseURI = nsContentUtils::IsLocalRefURL(href)
+    ? nsSVGEffects::GetBaseURLForLocalRef(this, originURI)
+    : originURI;
+
   nsCOMPtr<nsIURI> targetURI;
-  nsCOMPtr<nsIURI> baseURI = mOriginal ? mOriginal->GetBaseURI() : GetBaseURI();
   nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
                                             GetComposedDoc(), baseURI);
-
   mSource.Reset(this, targetURI);
 }
 
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