diff --git a/tests/lib/html/async_cancellingisolate.dart b/tests/lib/html/async_cancellingisolate.dart
deleted file mode 100644
index b04c5b1754d..00000000000
--- a/tests/lib/html/async_cancellingisolate.dart
+++ /dev/null
@@ -1,35 +0,0 @@
-// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-library async_cancellingisolate;
-
-import 'dart:async';
-import 'package:expect/minitest.dart';
-
-main(message, replyTo) {
-  var command = message.first;
-  expect(command, 'START');
-  var shot = false;
-  var oneshot;
-  var periodic;
-  periodic = new Timer.periodic(const Duration(milliseconds: 10), (timer) {
-    expect(shot, isFalse);
-    shot = true;
-    expect(timer, same(periodic));
-    periodic.cancel();
-    oneshot.cancel();
-    // Wait some more time to be sure callbacks won't be invoked any
-    // more.
-    new Timer(const Duration(milliseconds: 50), () {
-      replyTo.send('DONE');
-    });
-  });
-  // We launch the oneshot timer after the periodic timer. Otherwise a
-  // (very long) context switch could make this test flaky: assume the
-  // oneshot timer is created first and then there is a 30ms context switch.
-  // when the periodic timer is scheduled it would execute after the oneshot.
-  oneshot = new Timer(const Duration(milliseconds: 30), () {
-    fail('Should never be invoked');
-  });
-}
diff --git a/tests/lib/html/async_oneshot.dart b/tests/lib/html/async_oneshot.dart
deleted file mode 100644
index 475efe3a4b6..00000000000
--- a/tests/lib/html/async_oneshot.dart
+++ /dev/null
@@ -1,14 +0,0 @@
-// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:async';
-import 'package:expect/minitest.dart';
-
-main(message, replyTo) {
-  var command = message.first;
-  expect(command, 'START');
-  new Timer(const Duration(milliseconds: 10), () {
-    replyTo.send('DONE');
-  });
-}
diff --git a/tests/lib/html/async_periodictimer.dart b/tests/lib/html/async_periodictimer.dart
deleted file mode 100644
index 9837ae5a615..00000000000
--- a/tests/lib/html/async_periodictimer.dart
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-library async_periodictimer;
-
-import 'dart:async';
-import 'package:expect/minitest.dart';
-
-main(message, replyTo) {
-  var command = message.first;
-  expect(command, 'START');
-  int counter = 0;
-  new Timer.periodic(const Duration(milliseconds: 10), (timer) {
-    if (counter == 3) {
-      counter = 1024;
-      timer.cancel();
-      // Wait some more time to be sure callback won't be invoked any
-      // more.
-      new Timer(const Duration(milliseconds: 30), () {
-        replyTo.send('DONE');
-      });
-      return;
-    }
-    assert(counter < 3);
-    counter++;
-  });
-}
diff --git a/tests/lib/html/async_test.dart b/tests/lib/html/async_test.dart
deleted file mode 100644
index 7720d5a1895..00000000000
--- a/tests/lib/html/async_test.dart
+++ /dev/null
@@ -1,49 +0,0 @@
-// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-library async_test;
-
-import 'package:async_helper/async_minitest.dart';
-
-import 'dart:async';
-import 'dart:isolate';
-import 'dart:html';
-
-import 'async_oneshot.dart' as oneshot_test show main;
-import 'async_periodictimer.dart' as periodictimer_test show main;
-import 'async_cancellingisolate.dart' as cancelling_test show main;
-
-oneshot(message) => oneshot_test.main(message.first, message.last);
-periodicTimerIsolate(message) =>
-    periodictimer_test.main(message.first, message.last);
-cancellingIsolate(message) => cancelling_test.main(message.first, message.last);
-
-main() {
-  test('one shot timer in pure isolate', () {
-    var response = new ReceivePort();
-    var remote = Isolate.spawn(oneshot, [
-      ['START'],
-      response.sendPort
-    ]);
-    expect(remote.then((_) => response.first), completion('DONE'));
-  });
-
-  test('periodic timer in pure isolate', () {
-    var response = new ReceivePort();
-    var remote = Isolate.spawn(periodicTimerIsolate, [
-      ['START'],
-      response.sendPort
-    ]);
-    expect(remote.then((_) => response.first), completion('DONE'));
-  });
-
-  test('cancellation in pure isolate', () {
-    var response = new ReceivePort();
-    var remote = Isolate.spawn(cancellingIsolate, [
-      ['START'],
-      response.sendPort
-    ]);
-    expect(remote.then((_) => response.first), completion('DONE'));
-  });
-}
diff --git a/tests/lib/lib_dart2js.status b/tests/lib/lib_dart2js.status
index 953c14869fe..52bd162c874 100644
--- a/tests/lib/lib_dart2js.status
+++ b/tests/lib/lib_dart2js.status
@@ -7,7 +7,6 @@ convert/chunked_conversion_utf88_test: Slow, Pass
 convert/utf85_test: Slow, Pass
 developer/metrics_num_test: Skip # Because of an int / double type test.
 developer/timeline_test: Skip # Not supported
-html/async_test: SkipByDesign
 html/custom/document_register_basic_test: Slow, Pass
 html/custom/document_register_type_extensions_test/construction: Slow, Pass
 html/custom/document_register_type_extensions_test/registration: Slow, Pass