diff --git a/tests/wpt/metadata-layout-2020/css/css-animations/cancel-animation-shadow-slot-invalidation.html.ini b/tests/wpt/metadata-layout-2020/css/css-animations/cancel-animation-shadow-slot-invalidation.html.ini
new file mode 100644
index 00000000000..001271124aa
--- /dev/null
+++ b/tests/wpt/metadata-layout-2020/css/css-animations/cancel-animation-shadow-slot-invalidation.html.ini
@@ -0,0 +1,2 @@
+[cancel-animation-shadow-slot-invalidation.html]
+  expected: TIMEOUT