diff --git a/layout/reftests/text/reftest-stylo.list b/layout/reftests/text/reftest-stylo.list
index 2ca811bcbf9a..083a5f760100 100644
--- a/layout/reftests/text/reftest-stylo.list
+++ b/layout/reftests/text/reftest-stylo.list
@@ -254,25 +254,25 @@ HTTP(..) == graphite-surrogate-selection.html graphite-surrogate-selection.html
 == auto-hyphenation-8.html auto-hyphenation-8.html
 == auto-hyphenation-9.html auto-hyphenation-9.html
 == auto-hyphenation-10.html auto-hyphenation-10.html
-fails == auto-hyphenation-xmllang-1.xhtml auto-hyphenation-xmllang-1.xhtml # Bug 1341714
-fails == auto-hyphenation-xmllang-1.xhtml auto-hyphenation-xmllang-1.xhtml # Bug 1341714
-fails == auto-hyphenation-xmllang-1a.xhtml auto-hyphenation-xmllang-1a.xhtml
-fails == auto-hyphenation-xmllang-2.xhtml auto-hyphenation-xmllang-2.xhtml
+== auto-hyphenation-xmllang-1.xhtml auto-hyphenation-xmllang-1.xhtml # Bug 1341714
+== auto-hyphenation-xmllang-1.xhtml auto-hyphenation-xmllang-1.xhtml # Bug 1341714
+== auto-hyphenation-xmllang-1a.xhtml auto-hyphenation-xmllang-1a.xhtml
+== auto-hyphenation-xmllang-2.xhtml auto-hyphenation-xmllang-2.xhtml
 == auto-hyphenation-xmllang-3.xhtml auto-hyphenation-xmllang-3.xhtml
 == auto-hyphenation-xmllang-4.xhtml auto-hyphenation-xmllang-4.xhtml
-fails == auto-hyphenation-xmllang-5.xhtml auto-hyphenation-xmllang-5.xhtml
-fails == auto-hyphenation-xmllang-6.xhtml auto-hyphenation-xmllang-6.xhtml
-fails == auto-hyphenation-xmllang-7.xhtml auto-hyphenation-xmllang-7.xhtml
+== auto-hyphenation-xmllang-5.xhtml auto-hyphenation-xmllang-5.xhtml
+== auto-hyphenation-xmllang-6.xhtml auto-hyphenation-xmllang-6.xhtml
+== auto-hyphenation-xmllang-7.xhtml auto-hyphenation-xmllang-7.xhtml
 == auto-hyphenation-xmllang-8.xhtml auto-hyphenation-xmllang-8.xhtml
 == auto-hyphenation-xmllang-9.xhtml auto-hyphenation-xmllang-9.xhtml
 == auto-hyphenation-xmllang-10.xhtml auto-hyphenation-xmllang-10.xhtml
-fails == auto-hyphenation-xmllang-11a.xhtml auto-hyphenation-xmllang-11a.xhtml
-fails == auto-hyphenation-xmllang-11b.xhtml auto-hyphenation-xmllang-11b.xhtml
-fails == auto-hyphenation-xmllang-12a.xhtml auto-hyphenation-xmllang-12a.xhtml
-fails == auto-hyphenation-xmllang-12b.xhtml auto-hyphenation-xmllang-12b.xhtml
-fails == auto-hyphenation-xmllang-13a.xhtml auto-hyphenation-xmllang-13a.xhtml
+== auto-hyphenation-xmllang-11a.xhtml auto-hyphenation-xmllang-11a.xhtml
+== auto-hyphenation-xmllang-11b.xhtml auto-hyphenation-xmllang-11b.xhtml
+== auto-hyphenation-xmllang-12a.xhtml auto-hyphenation-xmllang-12a.xhtml
+== auto-hyphenation-xmllang-12b.xhtml auto-hyphenation-xmllang-12b.xhtml
+== auto-hyphenation-xmllang-13a.xhtml auto-hyphenation-xmllang-13a.xhtml
 == auto-hyphenation-xmllang-13b.xhtml auto-hyphenation-xmllang-13b.xhtml
-fails == auto-hyphenation-xmllang-14a.xhtml auto-hyphenation-xmllang-14a.xhtml
+== auto-hyphenation-xmllang-14a.xhtml auto-hyphenation-xmllang-14a.xhtml
 == auto-hyphenation-xmllang-14b.xhtml auto-hyphenation-xmllang-14b.xhtml
 == auto-hyphenation-af-1.html auto-hyphenation-af-1.html
 == auto-hyphenation-bg-1.html auto-hyphenation-bg-1.html
diff --git a/layout/style/ServoBindings.cpp b/layout/style/ServoBindings.cpp
index 8acc461b0691..41b8558c4554 100644
--- a/layout/style/ServoBindings.cpp
+++ b/layout/style/ServoBindings.cpp
@@ -553,6 +553,16 @@ Gecko_MatchStringArgPseudo(RawGeckoElementBorrowed aElement,
                                                  dummyMask, false, aSetSlowSelectorFlag, nullptr);
 }
 
+nsIAtom*
+Gecko_GetXMLLangValue(RawGeckoElementBorrowed aElement)
+{
+  nsString string;
+  if (aElement->GetAttr(kNameSpaceID_XML, nsGkAtoms::lang, string)) {
+    return NS_Atomize(string).take();
+  }
+  return nullptr;
+}
+
 template <typename Implementor>
 static nsIAtom*
 AtomAttrValue(Implementor* aElement, nsIAtom* aName)
diff --git a/layout/style/ServoBindings.h b/layout/style/ServoBindings.h
index 4018adca633f..2d5573a40e61 100644
--- a/layout/style/ServoBindings.h
+++ b/layout/style/ServoBindings.h
@@ -141,6 +141,8 @@ nsIAtom* Gecko_LocalName(RawGeckoElementBorrowed element);
 nsIAtom* Gecko_Namespace(RawGeckoElementBorrowed element);
 nsIAtom* Gecko_GetElementId(RawGeckoElementBorrowed element);
 
+nsIAtom* Gecko_GetXMLLangValue(RawGeckoElementBorrowed element);
+
 // Attributes.
 #define SERVO_DECLARE_ELEMENT_ATTR_MATCHING_FUNCTIONS(prefix_, implementor_)  \
   nsIAtom* prefix_##AtomAttrValue(implementor_ element, nsIAtom* attribute);  \