diff --git a/testing/web-platform/tests/html/webappapis/scripting/events/event-handler-processing-algorithm-error/document-synthetic-errorevent.html b/testing/web-platform/tests/html/webappapis/scripting/events/event-handler-processing-algorithm-error/document-synthetic-errorevent.html
index a541611909767..4165beaf63d5b 100644
--- a/testing/web-platform/tests/html/webappapis/scripting/events/event-handler-processing-algorithm-error/document-synthetic-errorevent.html
+++ b/testing/web-platform/tests/html/webappapis/scripting/events/event-handler-processing-algorithm-error/document-synthetic-errorevent.html
@@ -41,4 +41,20 @@
   assert_equals(e.colno, 0);
   assert_equals(e.error, undefined);
 }, "Initial values of ErrorEvent members")
+
+test(() => {
+  const e = new ErrorEvent("error", {error : null});
+  assert_equals(e.error, null);
+}, "error member can be set to null")
+
+test(() => {
+  const e = new ErrorEvent("error", {error : undefined});
+  assert_equals(e.error, undefined);
+}, "error member can be set to undefined")
+
+test(() => {
+  const e = new ErrorEvent("error", {error : "foo"});
+  assert_equals(e.error, "foo");
+}, "error member can be set to arbitrary")
+
 </script>