diff --git a/layout/reftests/reftest.list b/layout/reftests/reftest.list
index b2da025d5f86..f51103ec06de 100644
--- a/layout/reftests/reftest.list
+++ b/layout/reftests/reftest.list
@@ -365,6 +365,9 @@ include transform-3d/reftest.list
# unicode/ (verify that we don't do expend effort doing unicode-aware case checks)
include unicode/reftest.list
+# usercss
+include usercss/reftest.list
+
include view-source/reftest.list
# web-animations
diff --git a/layout/reftests/usercss/reftest.list b/layout/reftests/usercss/reftest.list
new file mode 100644
index 000000000000..511167c92e28
--- /dev/null
+++ b/layout/reftests/usercss/reftest.list
@@ -0,0 +1 @@
+== usercss.html usercss-ref.html
diff --git a/layout/reftests/usercss/usercss-ref.html b/layout/reftests/usercss/usercss-ref.html
new file mode 100644
index 000000000000..78538612c722
--- /dev/null
+++ b/layout/reftests/usercss/usercss-ref.html
@@ -0,0 +1,10 @@
+
+
+
+
+
+
+This paragraph should have a green background.
+This paragraph should have a green background, too.
+
+
diff --git a/layout/reftests/usercss/usercss.html b/layout/reftests/usercss/usercss.html
new file mode 100644
index 000000000000..ce8e3bd4f4ce
--- /dev/null
+++ b/layout/reftests/usercss/usercss.html
@@ -0,0 +1,10 @@
+
+
+
+
+
+
+This paragraph should have a green background.
+This paragraph should have a green background, too.
+
+