diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 394592aae1e..f4df83f7496 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -184,7 +184,6 @@ flaky_cpu == linebreak_simple_a.html linebreak_simple_b.html
== min_width_float_simple_a.html min_width_float_simple_b.html
== min_width_simple_a.html min_width_simple_b.html
== negative_margins_a.html negative_margins_b.html
-== no_image_background_a.html no_image_background_ref.html
!= noteq_attr_exists_selector.html attr_exists_selector_ref.html
!= octicons_a.html octicons_ref.html
== ol_japanese_iroha_a.html ol_japanese_iroha_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 8f399412bff..250b7b69473 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -899,6 +899,18 @@
"url": "/_mozilla/css/no-image.html"
}
],
+ "css/no_image_background_a.html": [
+ {
+ "path": "css/no_image_background_a.html",
+ "references": [
+ [
+ "/_mozilla/css/no_image_background_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/no_image_background_a.html"
+ }
+ ],
"css/noscript.html": [
{
"path": "css/noscript.html",
@@ -4080,6 +4092,18 @@
"url": "/_mozilla/css/no-image.html"
}
],
+ "css/no_image_background_a.html": [
+ {
+ "path": "css/no_image_background_a.html",
+ "references": [
+ [
+ "/_mozilla/css/no_image_background_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/no_image_background_a.html"
+ }
+ ],
"css/noscript.html": [
{
"path": "css/noscript.html",
diff --git a/tests/ref/no_image_background_a.html b/tests/wpt/mozilla/tests/css/no_image_background_a.html
similarity index 83%
rename from tests/ref/no_image_background_a.html
rename to tests/wpt/mozilla/tests/css/no_image_background_a.html
index 188112e3dc1..30618ac8775 100644
--- a/tests/ref/no_image_background_a.html
+++ b/tests/wpt/mozilla/tests/css/no_image_background_a.html
@@ -1,6 +1,7 @@
+