diff --git a/layout/reftests/text/arabic-marks-1-ref.html b/layout/reftests/text/arabic-marks-1-ref.html
new file mode 100644
index 000000000000..78c86992aa65
--- /dev/null
+++ b/layout/reftests/text/arabic-marks-1-ref.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>bug 873902 - marks should not affect width of Arabic text</title>
+<style>
+body {
+  background-color: white;
+  font-size: 50px;
+  margin: 20px;
+}
+
+/* Try several fonts that should be available on Windows; at least Courier New is also on OS X.
+   Elsewhere, we may fall back to default, which may or may not be "interesting" to test,
+   but should pass harmlessly unless there's actually a broken font that shapes badly. */
+#a {
+  font-family: Andalus;
+}
+#b {
+  font-family: Courier New;
+}
+#c {
+  font-family: Simplified Arabic;
+}
+
+.test {
+  color: white;
+}
+</style>
+</head>
+<body>
+<div id="a">
+foo<span class="test">الرحمن الرحيم</span>bar
+</div>
+<div id="b">
+foo<span class="test">الرحمن الرحيم</span>bar
+</div>
+<div id="c">
+foo<span class="test">الرحمن الرحيم</span>bar
+</div>
+</body>
+</html>
diff --git a/layout/reftests/text/arabic-marks-1.html b/layout/reftests/text/arabic-marks-1.html
new file mode 100644
index 000000000000..442de13ab78c
--- /dev/null
+++ b/layout/reftests/text/arabic-marks-1.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>bug 873902 - marks should not affect width of Arabic text</title>
+<style>
+body {
+  background-color: white;
+  font-size: 50px;
+  margin: 20px;
+}
+
+/* Try several fonts that should be available on Windows; at least Courier New is also on OS X.
+   Elsewhere, we may fall back to default, which may or may not be "interesting" to test,
+   but should pass harmlessly unless there's actually a broken font that shapes badly. */
+#a {
+  font-family: Andalus;
+}
+#b {
+  font-family: Courier New;
+}
+#c {
+  font-family: Simplified Arabic;
+}
+
+.test {
+  color: white;
+}
+</style>
+</head>
+<body>
+<div id="a">
+foo<span class="test">الرَّحْمَنِ الرَّحِيمِ</span>bar
+</div>
+<div id="b">
+foo<span class="test">الرَّحْمَنِ الرَّحِيمِ</span>bar
+</div>
+<div id="c">
+foo<span class="test">الرَّحْمَنِ الرَّحِيمِ</span>bar
+</div>
+</body>
+</html>
diff --git a/layout/reftests/text/reftest.list b/layout/reftests/text/reftest.list
index fa6813fb54b7..cca53a6e0157 100644
--- a/layout/reftests/text/reftest.list
+++ b/layout/reftests/text/reftest.list
@@ -157,6 +157,7 @@ skip-if(B2G) fails-if(cocoaWidget) HTTP(..) == arabic-fallback-1.html arabic-fal
 fails-if(cocoaWidget) HTTP(..) == arabic-fallback-2.html arabic-fallback-2-ref.html
 fails-if(cocoaWidget) HTTP(..) == arabic-fallback-3.html arabic-fallback-3-ref.html
 fails-if(!cocoaWidget) HTTP(..) != arabic-fallback-4.html arabic-fallback-4-notref.html
+== arabic-marks-1.html arabic-marks-1-ref.html
 
 == 726392-1.html 726392-1-ref.html
 == 726392-2.html 726392-2-ref.html
