'extends Element'

tests/html/html.status

Index: tests/html/html.status
diff --git a/tests/html/html.status b/tests/html/html.status
index 9fd619b5f94b0d2059934161f780cd7ce4eae92b..45fda94bc06a2486c0f3f2e86da818a99b3aab1d 100644
--- a/tests/html/html.status
+++ b/tests/html/html.status
@@ -6,14 +6,12 @@ async_window_test: Skip #TODO(gram): investigating
 event_test: Skip  # Issue 1996
 interactive_test: Skip # Must be run manually.
 
-# Issue 9326
-custom_elements_test/preregister: Fail
-custom_elements_test/lifecycle: Fail
-
-[ $compiler == dart2js ]
-# Document.register is unimplemented.
+[ $compiler == dart2js && $runtime != drt ]
 custom_elements_test: Skip
 
+[ $compiler == dart2js && $runtime == drt ]
+custom_elements_test/preregister: Fail  # Unclear what the preregister semantics should be.
+
 [ $compiler == dartanalyzer || $compiler == dart2analyzer ]
 # Document.register is unimplemented.
 custom_elements_test: Skip
@@ -25,6 +23,8 @@ audiobuffersourcenode_test: Pass, Fail, Crash # http://crbug.com/256601
 # postMessage in dartium always transfers the typed array buffer, never a view
 postmessage_structured_test/typed_arrays: Fail
 events_test: Pass, Fail # Issue 12489
+custom_elements_test/preregister: Fail # Issue 9326 - Implement "extends Element" in dartium
+custom_elements_test/lifecycle: Fail   # Issue 9326 - Implement "extends Element" in dartium
 
 [ $compiler == none && $runtime == drt && $system == windows ]
 worker_test/functional: Pass, Crash # Issue 9929.