diff --git a/testing/web-platform/tests/mathml/relations/html5-tree/tabindex-001.html b/testing/web-platform/tests/mathml/relations/html5-tree/tabindex-001.html
index b6806bce4fc4c..ea3935f1e26ca 100644
--- a/testing/web-platform/tests/mathml/relations/html5-tree/tabindex-001.html
+++ b/testing/web-platform/tests/mathml/relations/html5-tree/tabindex-001.html
@@ -191,8 +191,7 @@
 mrow
 .
 tabIndex
--
-1
+0
 "
 no
 attribute
@@ -231,8 +230,7 @@
 mrow
 .
 tabIndex
--
-1
+0
 "
 invalid
 "
@@ -270,8 +268,7 @@
 mrow
 .
 tabIndex
--
-1
+0
 "
 too
 large