diff --git a/dom/observable/tentative/EventTarget-on.any.js b/dom/observable/tentative/EventTarget-on.any.js
deleted file mode 100644
index 975880a361ec24..00000000000000
--- a/dom/observable/tentative/EventTarget-on.any.js
+++ /dev/null
@@ -1,61 +0,0 @@
-test(() => {
-  const target = new EventTarget();
-  assert_true(
-    typeof target.on === "function",
-    "EventTarget should have the on method"
-  );
-
-  const testEvents = target.on("test");
-  assert_true(
-    testEvents instanceof Observable,
-    "EventTarget.on should return an Observable"
-  );
-
-  const results = [];
-  testEvents.subscribe({
-    next: (value) => results.push(value),
-    error: () => assert_unreached("should not error"),
-    complete: () => assert_unreached("should not complete"),
-  });
-
-  assert_array_equals(results, [], "should not emit until the event fires");
-
-  const event = new Event("test");
-  target.dispatchEvent(event);
-  assert_array_equals(results, [event], "should emit the event");
-
-  target.dispatchEvent(event);
-  assert_array_equals(results, [event, event], "should emit the event");
-}, "EventTarget should have the on method");
-
-test(() => {
-  const target = new EventTarget();
-  const testEvents = target.on("test");
-  const ac = new AbortController();
-  const results = [];
-  testEvents.subscribe({
-    next: (value) => results.push(value),
-    error: () => assert_unreached("should not error"),
-    complete: () => assert_unreached("should not complete"),
-    signal: ac.signal,
-  });
-
-  assert_array_equals(results, [], "should not emit until the event fires");
-
-  const event1 = new Event("test");
-  const event2 = new Event("test");
-  const event3 = new Event("test");
-  target.dispatchEvent(event1);
-  target.dispatchEvent(event2);
-
-  assert_array_equals(results, [event1, event2], "should emit the events");
-
-  ac.abort();
-  target.dispatchEvent(event3);
-
-  assert_array_equals(
-    results,
-    [event1, event2],
-    "aborting the subscription should stop the emission of events"
-  );
-}, "aborting the subscriptoin should stop the emission of events");