diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index ced980b28f6..61ce1756a89 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -149,7 +149,6 @@ prefs:"layout.writing-mode.enabled" == iframe/size_attributes_vertical_writing_m
== input_button_margins_a.html input_button_margins_ref.html
== input_button_size_a.html input_button_size_ref.html
!= input_height_a.html input_height_ref.html
-== inset.html inset_ref.html
!= inset_blackborder.html blackborder_ref.html
== jpeg_normal.html jpeg_ref.html
== jpeg_progressive.html jpeg_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index ba949dfe889..ea7668649fe 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -731,6 +731,18 @@
"url": "/_mozilla/css/inline_padding_a.html"
}
],
+ "css/inset.html": [
+ {
+ "path": "css/inset.html",
+ "references": [
+ [
+ "/_mozilla/css/inset_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/inset.html"
+ }
+ ],
"css/issue-1324.html": [
{
"path": "css/issue-1324.html",
@@ -3780,6 +3792,18 @@
"url": "/_mozilla/css/inline_padding_a.html"
}
],
+ "css/inset.html": [
+ {
+ "path": "css/inset.html",
+ "references": [
+ [
+ "/_mozilla/css/inset_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/inset.html"
+ }
+ ],
"css/issue-1324.html": [
{
"path": "css/issue-1324.html",
diff --git a/tests/ref/inset.html b/tests/wpt/mozilla/tests/css/inset.html
similarity index 95%
rename from tests/ref/inset.html
rename to tests/wpt/mozilla/tests/css/inset.html
index 095303adab5..9fe98c73a7f 100644
--- a/tests/ref/inset.html
+++ b/tests/wpt/mozilla/tests/css/inset.html
@@ -1,6 +1,7 @@
+