Adding support checks for partially supported element types and updating tests.

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.
 
 window_open_test: Skip # http://dartbug.com/5151
 
 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
 
 [ $runtime == chrome ]
-contentelement_test: Fail   # Issue 5445: not currently supported on chrome stable.
 input_element_test/date: Pass, Fail      # Chrome stable does not support this input type.
 input_element_test/datetime: Fail        # Chrome stable does not support this input type.
 input_element_test/datetime-local: Fail  # Chrome stable does not support this input type.
 input_element_test/month: Fail           # Chrome stable does not support this input type.
 input_element_test/week: Fail            # Chrome stable does not support this input type.
 
 [ $runtime == chrome || $runtime == drt]
 audiobuffersourcenode_test: Pass, Fail  # AudiobufferSourceNode is flaky on Chrome and Dartium.
 audiocontext_test: Skip # Need to adjust to new API.
 
@@ skipping 35 matching lines @@
 unknownelement_test: Fail # Issue 4189
 
 [ $runtime == dartium || $runtime == chrome || $runtime == ie9 || $runtime == ie10 || $runtime == safari || $runtime == ff || $runtime == opera ]
 history_test: Fail
 
 [$runtime == ie10 ]
 # TODO(efortuna, blois): Triage.
 audiobuffersourcenode_test: Fail
 audiocontext_test: Fail
 canvasrenderingcontext2d_test: Fail, Pass
-contentelement_test: Fail
 css_test: Fail
 document_test/getCssCanvasContext: Fail # IE does not support this.
 element_test/additionalConstructors: Fail
 element_test/click: Fail                # IE does not support firing this event.
+element_types_test/supported_content: Fail
+element_types_test/supported_details: Fail
+element_types_test/supported_keygen: Fail
+element_types_test/supported_meter: Fail
+element_types_test/supported_object: Fail
+element_types_test/supported_output: Fail
 element_webkit_test: Fail
 exceptions_test: Fail
 fileapi_test: Fail
 indexeddb_1_test/supported: Fail         # IE10 does not support from file://
 inner_frame_test: Skip
 input_element_test/date: Fail            # IE10 does not support this input type.
 input_element_test/datetime: Fail        # IE10 does not support this input type.
 input_element_test/datetime-local: Fail  # IE10 does not support this input type.
 input_element_test/month: Fail           # IE10 does not support this input type.
 input_element_test/time: Fail            # IE10 does not support this input type.
@@ skipping 11 matching lines @@
 typed_arrays_1_test: Fail
 typed_arrays_arraybuffer_test: Fail
 typed_arrays_dataview_test: Fail
 url_test: Fail                           # IE10 does not support from file://
 websql_test: Fail
 window_open_test: Skip
 xhr_test: Fail
 xsltprocessor_test: Fail
 
 [ $runtime == ie9 ]
-contentelement_test: Fail   # ie9 does not support content element.
 document_test/getCssCanvasContext: Fail # IE does not support this.
 element_test/click: Fail                # IE does not support firing this event.
+element_types_test/supported_content: Fail
+element_types_test/supported_datalist: Fail
+element_types_test/supported_details: Fail
+element_types_test/supported_keygen: Fail
+element_types_test/supported_meter: Fail
+element_types_test/supported_object: Fail
+element_types_test/supported_output: Fail
+element_types_test/supported_progress: Fail
+element_types_test/supported_track: Fail
 form_data_test: Fail # Issue 4793.
 form_element_test: Fail # Issue 4793.
 inner_frame_test: Skip # Issue 5727 (timeout)
 typed_arrays_1_test: Skip   # ie9 does not have typed arrays.
 typed_arrays_2_test: Skip
 typed_arrays_3_test: Skip
 typed_arrays_4_test: Skip
 typed_arrays_5_test: Skip
 typed_arrays_arraybuffer_test: Skip
 typed_arrays_dataview_test: Skip
@@ skipping 40 matching lines @@
 xsltprocessor_test: Skip    # BUG(4016)
 isolates_test: Skip         # BUG(4016)
 xhr_test: Skip              # BUG(4016)
 xhr_cross_origin_test: Fail # Issue 6016.
 
 [ $runtime == safari ]
 # TODO(ahe, efortuna): These tests need to be retriaged now that we're testing
 # with Safari 6.
 audiocontext_test: Crash, Fail # Issue: 7414
 element_test/elements: Crash, Fail # Issue: 7414
+element_types_test/supported_datalist: Fail
 performance_api_test: Fail # window.performance.timing not in Safari 6.
 indexeddb_1_test/supported: Fail
 input_element_test/date: Fail            # Safari does not support this input type.
 input_element_test/datetime: Fail        # Safari does not support this input type.
 input_element_test/datetime-local: Fail  # Safari does not support this input type.
 input_element_test/month: Fail, Crash    # Safari does not support this input type.
 input_element_test/range: Fail, Crash    # TODO(efortuna): Please triage this failure.
 input_element_test/time: Fail, Crash     # Safari does not support this input type.
 input_element_test/week: Fail, Crash     # Safari does not support this input type.
 fileapi_test: Fail # requestFileSystem not supported in Safari 6.
 datalistelement_test: Fail # HTMLDataListElement not yet supported in Safari.
-contentelement_test: Fail # Safari 6 does not support content element.
 # TODO(efortuna): Make our test framework able to separate tests out by browser
 # version.
 datalistelement_test: Fail # Issue: 7414
 node_test: Skip # Issue 6457
 
 [ $runtime == opera && $system == windows ]
 htmlelement_test: Fail, Pass
 
 [ $runtime == opera && $system == macos ]
 html/element_test/constructors: Fail
 
 
 [ $runtime == opera ]
 document_test/getCssCanvasContext: Fail # Issue: 7413
 form_data_test: Fail # Issue: 7413
 keyboard_event_test: Fail # Issue: 7413
 xmldocument_2_test: Fail # Issue: 7413
 element_test/eventListening: Fail # Issue: 7413
 element_test/children: Fail # Issue: 7413
 audiobuffersourcenode_test: Fail
 cache_test: Fail
 canvas_test: Pass,Fail
-contentelement_test: Fail
 audiocontext_test: Fail
 blob_constructor_test: Fail
 canvas_using_html_test: Fail
 canvas_test: Fail
 css_test: Fail
 cssstyledeclaration_test: Fail
 element_add_test: Fail
 element_constructor_1_test: Fail
 element_test/constructors: Fail
 element_test/elements: Fail
@@ skipping 16 matching lines @@
 inner_frame_test: Skip # Timeout.
 js_interop_3_test: Skip # Timeout.
 js_interop_4_test: Skip # Timeout.
 isolates_test: Skip # Timeout.
 websql_test: Skip # Timeout.
 
 [ $runtime == ff ]
 audiobuffersourcenode_test: Fail # FF only has Audio element.
 audiocontext_test: Fail      # FF only has Audio element
 css_test: Fail               # No analog to WebKitCssMatrix
-contentelement_test: Fail    # FF does not support content element.
 dart_object_local_storage_test: Skip  # sessionStorage NS_ERROR_DOM_NOT_SUPPORTED_ERR
 document_test/getCssCanvasContext: Fail # FF does not support this.
 documentfragment_test: Fail
+element_types_test/supported_content: Fail
+element_types_test/supported_details: Fail
+element_types_test/supported_embed: Fail
+element_types_test/supported_track: Fail
+element_types_test/supported_keygen: Fail
 element_webkit_test: Fail
 exceptions_test: Fail      # Uses webkitotifications, no analogue in moz
 fileapi_test: Fail         # FF does not support filesystem APIs.
 indexeddb_1_test/supported: Fail  # FF disables indexedDB from file URLs.
 # setup code fails. prepare. (DOM callback has errors) Caught [object Event]
 inner_frame_test: Skip
 input_element_test/date: Fail            # FF does not support this input type.
 input_element_test/datetime: Fail        # FF does not support this input type.
 input_element_test/datetime-local: Fail  # FF does not support this input type.
 input_element_test/month: Fail           # FF does not support this input type.
@@ skipping 36 matching lines @@
 
 [ $compiler == dart2js && ($runtime == drt || $runtime == chrome || $runtime == ff || $runtime == safari) ]
 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.
 
 [ $compiler == dart2js && $runtime == ff ]
 xhr_test: Skip # Timeout
 inner_frame_test: Skip # Timeout
 svg_3_test: Skip # Timeout
 documentfragment_test: Skip # Timeout