diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 82a3950c966..e5e64d14a6c 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -237,7 +237,6 @@ flaky_cpu == linebreak_simple_a.html linebreak_simple_b.html
== overflow_wrap_a.html overflow_wrap_ref.html
== overflow_xy_a.html overflow_xy_ref.html
== per_glyph_font_fallback_a.html per_glyph_font_fallback_ref.html
-== percent_height.html percent_height_ref.html
resolution=300x300,device-pixel-ratio=2 != pixel_snapping_border_a.html pixel_snapping_border_ref.html
resolution=300x300,device-pixel-ratio=2 != pixel_snapping_position_a.html pixel_snapping_position_ref.html
# commented out because multiple layers don't work with reftests --pcwalton
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 32cbc6ea652..9b46d1dc618 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -683,6 +683,18 @@
"url": "/_mozilla/css/flex_nochild.html"
}
],
+ "css/percent_height.html": [
+ {
+ "path": "css/percent_height.html",
+ "references": [
+ [
+ "/_mozilla/css/percent_height_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/percent_height.html"
+ }
+ ],
"css/percentage_height_float_a.html": [
{
"path": "css/percentage_height_float_a.html",
@@ -3312,6 +3324,18 @@
"url": "/_mozilla/css/flex_nochild.html"
}
],
+ "css/percent_height.html": [
+ {
+ "path": "css/percent_height.html",
+ "references": [
+ [
+ "/_mozilla/css/percent_height_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/percent_height.html"
+ }
+ ],
"css/percentage_height_float_a.html": [
{
"path": "css/percentage_height_float_a.html",
diff --git a/tests/ref/percent_height.html b/tests/wpt/mozilla/tests/css/percent_height.html
similarity index 87%
rename from tests/ref/percent_height.html
rename to tests/wpt/mozilla/tests/css/percent_height.html
index 192efa3e7da..0acb14187ce 100644
--- a/tests/ref/percent_height.html
+++ b/tests/wpt/mozilla/tests/css/percent_height.html
@@ -1,6 +1,7 @@
+