Falky test is an html test, not a dom test.

tests/html/html.status

 # Copyright (c) 2012, 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.
 
 event_test: Skip  # Issue 1996
 webgl_1_test: Skip  # Issue 1495
 xmldocument_test: Skip  # XML in dart:html is incomplete
 xmlelement_test: Skip  # XML in dart:html is incomplete
 measurement_test: Pass, Fail  # Issue 1940
 
@@ skipping 104 matching lines @@
 # a browser environment.
 [ $compiler == dartc ]
 *: Skip
 
 [ $runtime == vm ]
 *: Skip
 
 [ $compiler == frog && $runtime == d8 ]
 *: Skip
 
+[ $compiler == frog && $runtime == chrome && $system == windows]
+css_test: Pass, Fail # Test is flaky Issue #2823
+
 # TODO(jmesserly): now that we have a bot, we need to set up Opera testing.
 [ $runtime == opera ]
 *: Skip
 
 [ $compiler == frog && $runtime == none ]
 *: Skip
 
 [ $compiler == dart2js && ($runtime == drt || $runtime == chrome || $runtime == ff) ]
 request_animation_frame_test: Skip # Async test hangs.
 
@@ skipping 12 matching lines @@
 dom_isolates_test: Fail # error: cannot resolve spawnDomIsolate
 
 [ $compiler == dart2js && ($runtime == drt || $runtime == chrome || $runtime == ff) ]
 isolates_test: Skip   # Timeout because leg does not support web workers.
 typed_arrays_1_test: Fail # dart2js doesn't support is checks with generic types.
 cross_frame_test: Fail # Issue 2774, iframe.contentDocument is accessible in dart:html
 
 # DOM errors.
 indexeddb_2_test: Fail # Uncaught error
 window_open_test: Fail # TypeError: Object [object Window] has no method 'close$0'