diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 9d5bc455e82..7829c960ca7 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -11,7 +11,6 @@ fragment=top != ../html/acid2.html acid2_ref.html
== acid2_noscroll.html acid2_ref_broken.html
flaky_cpu == append_style_a.html append_style_b.html
-== font_size.html font_size_ref.html
# `?` and `#` in the name is a test for https://github.com/servo/servo/issues/3340
== iframe/bg_color.html iframe/bg_color_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index efa721d3927..b51db1b86a0 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -1511,6 +1511,18 @@
"url": "/_mozilla/css/font_face_attribute.html"
}
],
+ "css/font_size.html": [
+ {
+ "path": "css/font_size.html",
+ "references": [
+ [
+ "/_mozilla/css/font_size_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/font_size.html"
+ }
+ ],
"css/font_style.html": [
{
"path": "css/font_style.html",
@@ -6372,6 +6384,18 @@
"url": "/_mozilla/css/font_face_attribute.html"
}
],
+ "css/font_size.html": [
+ {
+ "path": "css/font_size.html",
+ "references": [
+ [
+ "/_mozilla/css/font_size_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/font_size.html"
+ }
+ ],
"css/font_style.html": [
{
"path": "css/font_style.html",
diff --git a/tests/ref/font_size.html b/tests/wpt/mozilla/tests/css/font_size.html
similarity index 94%
rename from tests/ref/font_size.html
rename to tests/wpt/mozilla/tests/css/font_size.html
index 7c500513bcb..04b7ef1a0c7 100644
--- a/tests/ref/font_size.html
+++ b/tests/wpt/mozilla/tests/css/font_size.html
@@ -1,5 +1,6 @@
font-size (issues #1435, #3417)
+24pt is 32px.
diff --git a/tests/ref/font_size_ref.html b/tests/wpt/mozilla/tests/css/font_size_ref.html
similarity index 100%
rename from tests/ref/font_size_ref.html
rename to tests/wpt/mozilla/tests/css/font_size_ref.html