diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 8a44f97a0f4..a842da0f577 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -35,8 +35,6 @@ prefs:"layout.writing-mode.enabled" == iframe/size_attributes_vertical_writing_m
== iframe/stacking_context_position_a.html iframe/stacking_context_position_ref.html
# inline_border_a.html inline_border_b.html
-== legacy_td_width_attribute_a.html legacy_td_width_attribute_ref.html
-== legacy_th_width_attribute_a.html legacy_td_width_attribute_ref.html
== line_height_a.html line_height_ref.html
!= linear_gradients_corners_a.html linear_gradients_corners_ref.html
!= linear_gradients_smoke_a.html linear_gradients_smoke_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 644af221b91..98080733ad0 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -2319,6 +2319,30 @@
"url": "/_mozilla/css/legacy_td_bgcolor_attribute_a.html"
}
],
+ "css/legacy_td_width_attribute_a.html": [
+ {
+ "path": "css/legacy_td_width_attribute_a.html",
+ "references": [
+ [
+ "/_mozilla/css/legacy_td_width_attribute_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/legacy_td_width_attribute_a.html"
+ }
+ ],
+ "css/legacy_th_width_attribute_a.html": [
+ {
+ "path": "css/legacy_th_width_attribute_a.html",
+ "references": [
+ [
+ "/_mozilla/css/legacy_td_width_attribute_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/legacy_th_width_attribute_a.html"
+ }
+ ],
"css/letter_spacing_a.html": [
{
"path": "css/letter_spacing_a.html",
@@ -7432,6 +7456,30 @@
"url": "/_mozilla/css/legacy_td_bgcolor_attribute_a.html"
}
],
+ "css/legacy_td_width_attribute_a.html": [
+ {
+ "path": "css/legacy_td_width_attribute_a.html",
+ "references": [
+ [
+ "/_mozilla/css/legacy_td_width_attribute_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/legacy_td_width_attribute_a.html"
+ }
+ ],
+ "css/legacy_th_width_attribute_a.html": [
+ {
+ "path": "css/legacy_th_width_attribute_a.html",
+ "references": [
+ [
+ "/_mozilla/css/legacy_td_width_attribute_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/legacy_th_width_attribute_a.html"
+ }
+ ],
"css/letter_spacing_a.html": [
{
"path": "css/letter_spacing_a.html",
diff --git a/tests/ref/legacy_td_width_attribute_a.html b/tests/wpt/mozilla/tests/css/legacy_td_width_attribute_a.html
similarity index 87%
rename from tests/ref/legacy_td_width_attribute_a.html
rename to tests/wpt/mozilla/tests/css/legacy_td_width_attribute_a.html
index f060ffd637e..044dc7365f9 100644
--- a/tests/ref/legacy_td_width_attribute_a.html
+++ b/tests/wpt/mozilla/tests/css/legacy_td_width_attribute_a.html
@@ -1,6 +1,7 @@
+