diff --git a/testing/web-platform/meta/html/dom/interfaces.html.ini b/testing/web-platform/meta/html/dom/interfaces.html.ini
index 92350c684f68..64288f78612c 100644
--- a/testing/web-platform/meta/html/dom/interfaces.html.ini
+++ b/testing/web-platform/meta/html/dom/interfaces.html.ini
@@ -1,5 +1,6 @@
 [interfaces.html]
   type: testharness
+  prefs: [dom.forms.inputmode:true]
   [Document interface: attribute domain]
     expected: FAIL