diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 778bfe31386..516fa073509 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -102,7 +102,6 @@ prefs:"layout.writing-mode.enabled" == iframe/size_attributes_vertical_writing_m
== img_dynamic_remove.html img_dynamic_remove_ref.html
== img_padding_a.html img_padding_b.html
!= img_simple.html img_simple_ref.html
-== img_width_attribute_intrinsic_width_a.html img_width_attribute_intrinsic_width_ref.html
!= inline_background_a.html inline_background_ref.html
== inline_block_border_intrinsic_size_a.html inline_block_border_intrinsic_size_ref.html
== inline_block_margin_auto_a.html inline_block_margin_auto_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index f9a0f389cd8..9703592bc19 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -815,6 +815,18 @@
"url": "/_mozilla/css/img_size_a.html"
}
],
+ "css/img_width_attribute_intrinsic_width_a.html": [
+ {
+ "path": "css/img_width_attribute_intrinsic_width_a.html",
+ "references": [
+ [
+ "/_mozilla/css/img_width_attribute_intrinsic_width_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/img_width_attribute_intrinsic_width_a.html"
+ }
+ ],
"css/img_width_style_intrinsic_width_a.html": [
{
"path": "css/img_width_style_intrinsic_width_a.html",
@@ -4728,6 +4740,18 @@
"url": "/_mozilla/css/img_size_a.html"
}
],
+ "css/img_width_attribute_intrinsic_width_a.html": [
+ {
+ "path": "css/img_width_attribute_intrinsic_width_a.html",
+ "references": [
+ [
+ "/_mozilla/css/img_width_attribute_intrinsic_width_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/img_width_attribute_intrinsic_width_a.html"
+ }
+ ],
"css/img_width_style_intrinsic_width_a.html": [
{
"path": "css/img_width_style_intrinsic_width_a.html",
diff --git a/tests/ref/img_width_attribute_intrinsic_width_a.html b/tests/wpt/mozilla/tests/css/img_width_attribute_intrinsic_width_a.html
similarity index 90%
rename from tests/ref/img_width_attribute_intrinsic_width_a.html
rename to tests/wpt/mozilla/tests/css/img_width_attribute_intrinsic_width_a.html
index 58ea5d9227f..9e8ce593df4 100644
--- a/tests/ref/img_width_attribute_intrinsic_width_a.html
+++ b/tests/wpt/mozilla/tests/css/img_width_attribute_intrinsic_width_a.html
@@ -1,6 +1,7 @@
+
diff --git a/tests/ref/img_width_attribute_intrinsic_width_ref.html b/tests/wpt/mozilla/tests/css/img_width_attribute_intrinsic_width_ref.html
similarity index 100%
rename from tests/ref/img_width_attribute_intrinsic_width_ref.html
rename to tests/wpt/mozilla/tests/css/img_width_attribute_intrinsic_width_ref.html