diff --git a/testing/web-platform/meta/encoding/idlharness.any.js.ini b/testing/web-platform/meta/encoding/idlharness.any.js.ini
new file mode 100644
index 000000000000..324fb7aa35c1
--- /dev/null
+++ b/testing/web-platform/meta/encoding/idlharness.any.js.ini
@@ -0,0 +1,2 @@
+[idlharness.https.any.serviceworker.html]
+  expected: TIMEOUT