diff --git a/src/test/ref/background_a.html b/src/test/ref/background_a.html
new file mode 100644
index 00000000000..28bc8f6b21d
--- /dev/null
+++ b/src/test/ref/background_a.html
@@ -0,0 +1,9 @@
+
+
+
+
+
+
+
+
+
diff --git a/src/test/ref/background_b.html b/src/test/ref/background_b.html
new file mode 100644
index 00000000000..11faa177fb7
--- /dev/null
+++ b/src/test/ref/background_b.html
@@ -0,0 +1,9 @@
+
+
+
+
+
+
+
+
+
diff --git a/src/test/ref/basic.list b/src/test/ref/basic.list
index 290a00741ca..bfd262afecb 100644
--- a/src/test/ref/basic.list
+++ b/src/test/ref/basic.list
@@ -29,3 +29,4 @@
== position_relative_a.html position_relative_b.html
== attr_exists_selector.html attr_exists_selector_ref.html
== data_img_a.html data_img_b.html
+== background_a.html background_b.html