Fix all dart:html strong mode errors except for spurious FINAL_NOT_INITIALIZED_CONSTRUCTOR warnings.

tool/sdk_expected_errors.txt

Index: tool/sdk_expected_errors.txt
diff --git a/tool/sdk_expected_errors.txt b/tool/sdk_expected_errors.txt
index 2090523e3acd4d3c8258f93c810efa767dd071c2..14e96f2436e6c71eb6fc614567b9ec134ef4aeb1 100644
--- a/tool/sdk_expected_errors.txt
+++ b/tool/sdk_expected_errors.txt
@@ -5,231 +5,26 @@
 [error] Annotation can be only constant variable or constant constructor invocation (dart:core/stacktrace.dart, line 27, col 3)
 [error] The class 'StackTrace' does not have a constructor 'fromString' (dart:core/stacktrace.dart, line 31, col 48)
 [error] The class 'StackTrace' does not have a constructor 'fromString' (dart:core/stacktrace.dart, line 35, col 50)
-[error] The setter 'href' is not defined for the class 'Element'. (dart:html, line 172, col 25)
-[error] The setter 'width' is not defined for the class 'Element'. (dart:html, line 1561, col 26)
-[error] The setter 'height' is not defined for the class 'Element'. (dart:html, line 1562, col 27)
-[error] The method '_initCompositionEvent' is not defined for the class 'Event'. (dart:html, line 2631, col 9)
-[error] The method '_initDeviceOrientationEvent' is not defined for the class 'Event'. (dart:html, line 8676, col 7)
-[error] Field declaration DomMatrixReadOnly.a cannot be overridden in DomMatrix. (dart:html, line 10233, col 3)
-[error] Invalid override. The type of DomMatrix.a (() → num) is not a subtype of DomMatrixReadOnly.a (() → double). (dart:html, line 10233, col 3)
-[error] Field declaration DomMatrixReadOnly.b cannot be overridden in DomMatrix. (dart:html, line 10240, col 3)
-[error] Invalid override. The type of DomMatrix.b (() → num) is not a subtype of DomMatrixReadOnly.b (() → double). (dart:html, line 10240, col 3)
-[error] Field declaration DomMatrixReadOnly.c cannot be overridden in DomMatrix. (dart:html, line 10247, col 3)
-[error] Invalid override. The type of DomMatrix.c (() → num) is not a subtype of DomMatrixReadOnly.c (() → double). (dart:html, line 10247, col 3)
-[error] Field declaration DomMatrixReadOnly.d cannot be overridden in DomMatrix. (dart:html, line 10254, col 3)
-[error] Invalid override. The type of DomMatrix.d (() → num) is not a subtype of DomMatrixReadOnly.d (() → double). (dart:html, line 10254, col 3)
-[error] Field declaration DomMatrixReadOnly.e cannot be overridden in DomMatrix. (dart:html, line 10261, col 3)
-[error] Invalid override. The type of DomMatrix.e (() → num) is not a subtype of DomMatrixReadOnly.e (() → double). (dart:html, line 10261, col 3)
-[error] Field declaration DomMatrixReadOnly.f cannot be overridden in DomMatrix. (dart:html, line 10268, col 3)
-[error] Invalid override. The type of DomMatrix.f (() → num) is not a subtype of DomMatrixReadOnly.f (() → double). (dart:html, line 10268, col 3)
-[error] Field declaration DomMatrixReadOnly.m11 cannot be overridden in DomMatrix. (dart:html, line 10275, col 3)
-[error] Invalid override. The type of DomMatrix.m11 (() → num) is not a subtype of DomMatrixReadOnly.m11 (() → double). (dart:html, line 10275, col 3)
-[error] Field declaration DomMatrixReadOnly.m12 cannot be overridden in DomMatrix. (dart:html, line 10282, col 3)
-[error] Invalid override. The type of DomMatrix.m12 (() → num) is not a subtype of DomMatrixReadOnly.m12 (() → double). (dart:html, line 10282, col 3)
-[error] Field declaration DomMatrixReadOnly.m13 cannot be overridden in DomMatrix. (dart:html, line 10289, col 3)
-[error] Invalid override. The type of DomMatrix.m13 (() → num) is not a subtype of DomMatrixReadOnly.m13 (() → double). (dart:html, line 10289, col 3)
-[error] Field declaration DomMatrixReadOnly.m14 cannot be overridden in DomMatrix. (dart:html, line 10296, col 3)
-[error] Invalid override. The type of DomMatrix.m14 (() → num) is not a subtype of DomMatrixReadOnly.m14 (() → double). (dart:html, line 10296, col 3)
-[error] Field declaration DomMatrixReadOnly.m21 cannot be overridden in DomMatrix. (dart:html, line 10303, col 3)
-[error] Invalid override. The type of DomMatrix.m21 (() → num) is not a subtype of DomMatrixReadOnly.m21 (() → double). (dart:html, line 10303, col 3)
-[error] Field declaration DomMatrixReadOnly.m22 cannot be overridden in DomMatrix. (dart:html, line 10310, col 3)
-[error] Invalid override. The type of DomMatrix.m22 (() → num) is not a subtype of DomMatrixReadOnly.m22 (() → double). (dart:html, line 10310, col 3)
-[error] Field declaration DomMatrixReadOnly.m23 cannot be overridden in DomMatrix. (dart:html, line 10317, col 3)
-[error] Invalid override. The type of DomMatrix.m23 (() → num) is not a subtype of DomMatrixReadOnly.m23 (() → double). (dart:html, line 10317, col 3)
-[error] Field declaration DomMatrixReadOnly.m24 cannot be overridden in DomMatrix. (dart:html, line 10324, col 3)
-[error] Invalid override. The type of DomMatrix.m24 (() → num) is not a subtype of DomMatrixReadOnly.m24 (() → double). (dart:html, line 10324, col 3)
-[error] Field declaration DomMatrixReadOnly.m31 cannot be overridden in DomMatrix. (dart:html, line 10331, col 3)
-[error] Invalid override. The type of DomMatrix.m31 (() → num) is not a subtype of DomMatrixReadOnly.m31 (() → double). (dart:html, line 10331, col 3)
-[error] Field declaration DomMatrixReadOnly.m32 cannot be overridden in DomMatrix. (dart:html, line 10338, col 3)
-[error] Invalid override. The type of DomMatrix.m32 (() → num) is not a subtype of DomMatrixReadOnly.m32 (() → double). (dart:html, line 10338, col 3)
-[error] Field declaration DomMatrixReadOnly.m33 cannot be overridden in DomMatrix. (dart:html, line 10345, col 3)
-[error] Invalid override. The type of DomMatrix.m33 (() → num) is not a subtype of DomMatrixReadOnly.m33 (() → double). (dart:html, line 10345, col 3)
-[error] Field declaration DomMatrixReadOnly.m34 cannot be overridden in DomMatrix. (dart:html, line 10352, col 3)
-[error] Invalid override. The type of DomMatrix.m34 (() → num) is not a subtype of DomMatrixReadOnly.m34 (() → double). (dart:html, line 10352, col 3)
-[error] Field declaration DomMatrixReadOnly.m41 cannot be overridden in DomMatrix. (dart:html, line 10359, col 3)
-[error] Invalid override. The type of DomMatrix.m41 (() → num) is not a subtype of DomMatrixReadOnly.m41 (() → double). (dart:html, line 10359, col 3)
-[error] Field declaration DomMatrixReadOnly.m42 cannot be overridden in DomMatrix. (dart:html, line 10366, col 3)
-[error] Invalid override. The type of DomMatrix.m42 (() → num) is not a subtype of DomMatrixReadOnly.m42 (() → double). (dart:html, line 10366, col 3)
-[error] Field declaration DomMatrixReadOnly.m43 cannot be overridden in DomMatrix. (dart:html, line 10373, col 3)
-[error] Invalid override. The type of DomMatrix.m43 (() → num) is not a subtype of DomMatrixReadOnly.m43 (() → double). (dart:html, line 10373, col 3)
-[error] Field declaration DomMatrixReadOnly.m44 cannot be overridden in DomMatrix. (dart:html, line 10380, col 3)
-[error] Invalid override. The type of DomMatrix.m44 (() → num) is not a subtype of DomMatrixReadOnly.m44 (() → double). (dart:html, line 10380, col 3)
-[error] Field declaration DomPointReadOnly.w cannot be overridden in DomPoint. (dart:html, line 10651, col 3)
-[error] Invalid override. The type of DomPoint.w (() → num) is not a subtype of DomPointReadOnly.w (() → double). (dart:html, line 10651, col 3)
-[error] Field declaration DomPointReadOnly.x cannot be overridden in DomPoint. (dart:html, line 10658, col 3)
-[error] Invalid override. The type of DomPoint.x (() → num) is not a subtype of DomPointReadOnly.x (() → double). (dart:html, line 10658, col 3)
-[error] Field declaration DomPointReadOnly.y cannot be overridden in DomPoint. (dart:html, line 10665, col 3)
-[error] Invalid override. The type of DomPoint.y (() → num) is not a subtype of DomPointReadOnly.y (() → double). (dart:html, line 10665, col 3)
-[error] Field declaration DomPointReadOnly.z cannot be overridden in DomPoint. (dart:html, line 10672, col 3)
-[error] Invalid override. The type of DomPoint.z (() → num) is not a subtype of DomPointReadOnly.z (() → double). (dart:html, line 10672, col 3)
-[error] Invalid override. The type of DomStringList.contains ((String) → bool) is not a subtype of Iterable<String>.contains ((Object) → bool). (dart:html, line 10951, col 3)
-[error] Invalid override. The type of DomStringList.contains ((String) → bool) is not a subtype of ListMixin<String>.contains ((Object) → bool). (dart:html, line 10951, col 3)
-[error] 'firstWhere' is inherited by at least two interfaces inconsistently, from ((dynamic) → bool, {orElse: () → dynamic}) → dynamic, ((Element) → bool, {orElse: () → Element}) → Element (dart:html, line 11738, col 7)
-[error] 'lastWhere' is inherited by at least two interfaces inconsistently, from ((dynamic) → bool, {orElse: () → dynamic}) → dynamic, ((Element) → bool, {orElse: () → Element}) → Element (dart:html, line 11738, col 7)
-[error] 'reduce' is inherited by at least two interfaces inconsistently, from ((dynamic, dynamic) → dynamic) → dynamic, ((Element, Element) → Element) → Element (dart:html, line 11738, col 7)
-[error] 'singleWhere' is inherited by at least two interfaces inconsistently, from ((dynamic) → bool) → dynamic, ((Element) → bool) → Element (dart:html, line 11738, col 7)
-[error] 'skipWhile' is inherited by at least two interfaces inconsistently, from ((dynamic) → bool) → Iterable<dynamic>, ((Element) → bool) → Iterable<Element> (dart:html, line 11738, col 7)
-[error] 'takeWhile' is inherited by at least two interfaces inconsistently, from ((dynamic) → bool) → Iterable<dynamic>, ((Element) → bool) → Iterable<Element> (dart:html, line 11738, col 7)
-[error] 'where' is inherited by at least two interfaces inconsistently, from ((dynamic) → bool) → Iterable<dynamic>, ((Element) → bool) → Iterable<Element> (dart:html, line 11738, col 7)
-[error] Missing concrete implementation of 'ListMixin.add', 'ListMixin.asMap', 'ListMixin.elementAt', 'ListMixin.fillRange' and 11 more (dart:html, line 11738, col 7)
-[error] Base class introduces an invalid override. The type of ListMixin.add ((dynamic) → void) is not a subtype of List<Element>.add ((Element) → void). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.add ((dynamic) → void) is not a subtype of ListMixin<Element>.add ((Element) → void). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.asMap (() → Map<int, dynamic>) is not a subtype of List<Element>.asMap (() → Map<int, Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.asMap (() → Map<int, dynamic>) is not a subtype of ListMixin<Element>.asMap (() → Map<int, Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.elementAt ((int) → dynamic) is not a subtype of Iterable<Element>.elementAt ((int) → Element). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.elementAt ((int) → dynamic) is not a subtype of ListMixin<Element>.elementAt ((int) → Element). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.fillRange ((int, int, [dynamic]) → void) is not a subtype of List<Element>.fillRange ((int, int, [Element]) → void). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.fillRange ((int, int, [dynamic]) → void) is not a subtype of ListMixin<Element>.fillRange ((int, int, [Element]) → void). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.firstWhere (((dynamic) → bool, {orElse: () → dynamic}) → dynamic) is not a subtype of Iterable<Element>.firstWhere (((Element) → bool, {orElse: () → Element}) → Element). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.firstWhere (((dynamic) → bool, {orElse: () → dynamic}) → dynamic) is not a subtype of ListMixin<Element>.firstWhere (((Element) → bool, {orElse: () → Element}) → Element). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.getRange ((int, int) → Iterable<dynamic>) is not a subtype of List<Element>.getRange ((int, int) → Iterable<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.getRange ((int, int) → Iterable<dynamic>) is not a subtype of ListMixin<Element>.getRange ((int, int) → Iterable<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.insert ((int, dynamic) → void) is not a subtype of List<Element>.insert ((int, Element) → void). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.insert ((int, dynamic) → void) is not a subtype of ListMixin<Element>.insert ((int, Element) → void). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.iterator (() → Iterator<dynamic>) is not a subtype of Iterable<Element>.iterator (() → Iterator<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.iterator (() → Iterator<dynamic>) is not a subtype of ListMixin<Element>.iterator (() → Iterator<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.lastWhere (((dynamic) → bool, {orElse: () → dynamic}) → dynamic) is not a subtype of Iterable<Element>.lastWhere (((Element) → bool, {orElse: () → Element}) → Element). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.lastWhere (((dynamic) → bool, {orElse: () → dynamic}) → dynamic) is not a subtype of ListMixin<Element>.lastWhere (((Element) → bool, {orElse: () → Element}) → Element). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.reduce (((dynamic, dynamic) → dynamic) → dynamic) is not a subtype of Iterable<Element>.reduce (((Element, Element) → Element) → Element). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.reduce (((dynamic, dynamic) → dynamic) → dynamic) is not a subtype of ListMixin<Element>.reduce (((Element, Element) → Element) → Element). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.removeAt ((int) → dynamic) is not a subtype of List<Element>.removeAt ((int) → Element). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.removeAt ((int) → dynamic) is not a subtype of ListMixin<Element>.removeAt ((int) → Element). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.removeLast (() → dynamic) is not a subtype of List<Element>.removeLast (() → Element). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.removeLast (() → dynamic) is not a subtype of ListMixin<Element>.removeLast (() → Element). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.reversed (() → Iterable<dynamic>) is not a subtype of List<Element>.reversed (() → Iterable<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.reversed (() → Iterable<dynamic>) is not a subtype of ListMixin<Element>.reversed (() → Iterable<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.singleWhere (((dynamic) → bool) → dynamic) is not a subtype of Iterable<Element>.singleWhere (((Element) → bool) → Element). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.singleWhere (((dynamic) → bool) → dynamic) is not a subtype of ListMixin<Element>.singleWhere (((Element) → bool) → Element). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.skip ((int) → Iterable<dynamic>) is not a subtype of Iterable<Element>.skip ((int) → Iterable<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.skip ((int) → Iterable<dynamic>) is not a subtype of ListMixin<Element>.skip ((int) → Iterable<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.skipWhile (((dynamic) → bool) → Iterable<dynamic>) is not a subtype of Iterable<Element>.skipWhile (((Element) → bool) → Iterable<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.skipWhile (((dynamic) → bool) → Iterable<dynamic>) is not a subtype of ListMixin<Element>.skipWhile (((Element) → bool) → Iterable<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.sublist ((int, [int]) → List<dynamic>) is not a subtype of List<Element>.sublist ((int, [int]) → List<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.sublist ((int, [int]) → List<dynamic>) is not a subtype of ListMixin<Element>.sublist ((int, [int]) → List<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.take ((int) → Iterable<dynamic>) is not a subtype of Iterable<Element>.take ((int) → Iterable<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.take ((int) → Iterable<dynamic>) is not a subtype of ListMixin<Element>.take ((int) → Iterable<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.takeWhile (((dynamic) → bool) → Iterable<dynamic>) is not a subtype of Iterable<Element>.takeWhile (((Element) → bool) → Iterable<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.takeWhile (((dynamic) → bool) → Iterable<dynamic>) is not a subtype of ListMixin<Element>.takeWhile (((Element) → bool) → Iterable<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.toList (({growable: bool}) → List<dynamic>) is not a subtype of Iterable<Element>.toList (({growable: bool}) → List<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.toList (({growable: bool}) → List<dynamic>) is not a subtype of ListMixin<Element>.toList (({growable: bool}) → List<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.toSet (() → Set<dynamic>) is not a subtype of Iterable<Element>.toSet (() → Set<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.toSet (() → Set<dynamic>) is not a subtype of ListMixin<Element>.toSet (() → Set<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.where (((dynamic) → bool) → Iterable<dynamic>) is not a subtype of Iterable<Element>.where (((Element) → bool) → Iterable<Element>). (dart:html, line 11738, col 26)
-[error] Base class introduces an invalid override. The type of ListMixin.where (((dynamic) → bool) → Iterable<dynamic>) is not a subtype of ListMixin<Element>.where (((Element) → bool) → Iterable<Element>). (dart:html, line 11738, col 26)
-[error] Invalid override. The type of _FrozenElementList.sort (([(Element, Element) → int]) → void) is not a subtype of ListMixin<dynamic>.sort (([(dynamic, dynamic) → int]) → void). (dart:html, line 11756, col 3)
-[error] The setter 'classes' is not defined for the class 'Node'. (dart:html, line 11782, col 32)
-[error] The setter 'href' is not defined for the class 'Element'. (dart:html, line 13233, col 12)
-[error] The method 'matches' is not defined for the class 'EventTarget'. (dart:html, line 15341, col 18)
-[error] The getter 'parent' is not defined for the class 'EventTarget'. (dart:html, line 15342, col 23)
-[error] The getter 'parent' is not defined for the class 'EventTarget'. (dart:html, line 15343, col 56)
-[error] Field declaration Events._ptr cannot be overridden in ElementEvents. (dart:html, line 15642, col 3)
-[error] Field declaration Document.fullscreenElement cannot be overridden in HtmlDocument. (dart:html, line 18163, col 3)
-[error] Field declaration Document.fullscreenEnabled cannot be overridden in HtmlDocument. (dart:html, line 18179, col 3)
-[error] Field declaration Document.hidden cannot be overridden in HtmlDocument. (dart:html, line 18185, col 3)
-[error] Field declaration Document.visibilityState cannot be overridden in HtmlDocument. (dart:html, line 18192, col 3)
-[error] Invalid override. The type of HtmlFormControlsCollection.namedItem ((String) → Object) is not a subtype of HtmlCollection.namedItem ((String) → Element). (dart:html, line 18314, col 3)
-[error] The method 'convertDartClosureToJS' is not defined for the class 'HttpRequest'. (dart:html, line 18659, col 33)
-[error] The method 'convertDartClosureToJS' is not defined for the class 'HttpRequest'. (dart:html, line 18663, col 34)
-[error] The setter 'src' is not defined for the class 'Element'. (dart:html, line 19358, col 24)
-[error] The setter 'width' is not defined for the class 'Element'. (dart:html, line 19359, col 26)
-[error] The setter 'height' is not defined for the class 'Element'. (dart:html, line 19360, col 27)
-[error] The setter 'type' is not defined for the class 'Element'. (dart:html, line 19484, col 11)
-[error] The method '_initKeyboardEvent' is not defined for the class 'Event'. (dart:html, line 20403, col 7)
-[error] The method '_initMessageEvent' is not defined for the class 'Event'. (dart:html, line 22233, col 11)
-[error] The method '_initMouseEvent' is not defined for the class 'Event'. (dart:html, line 22890, col 11)
-[error] The method 'convertDartClosureToJS' is not defined for the class 'MutationObserver'. (dart:html, line 23178, col 9)
-[error] The argument type 'List<Element>' cannot be assigned to the parameter type 'Iterable<OptionElement>'. (dart:html, line 27303, col 37)
-[error] Invalid override. The type of SharedWorker.onError (() → Stream<Event>) is not a subtype of AbstractWorker.onError (() → Stream<ErrorEvent>). (dart:html, line 27863, col 3)
-[error] Invalid override. The type of Storage.containsValue ((String) → bool) is not a subtype of Map<String, String>.containsValue ((Object) → bool). (dart:html, line 28875, col 3)
-[error] Invalid override. The type of Storage.containsKey ((String) → bool) is not a subtype of Map<String, String>.containsKey ((Object) → bool). (dart:html, line 28877, col 3)
-[error] Invalid override. The type of Storage.[] ((String) → String) is not a subtype of Map<String, String>.[] ((Object) → String). (dart:html, line 28879, col 3)
-[error] Invalid override. The type of Storage.remove ((String) → String) is not a subtype of Map<String, String>.remove ((Object) → String). (dart:html, line 28888, col 3)
-[error] The method '_initStorageEvent' is not defined for the class 'Event'. (dart:html, line 28995, col 7)
-[error] The method '_initTextEvent' is not defined for the class 'Event'. (dart:html, line 29806, col 7)
-[error] The method '_initTouchEvent' is not defined for the class 'Event'. (dart:html, line 30466, col 7)
-[error] The method '_initUIEvent' is not defined for the class 'Event'. (dart:html, line 30796, col 7)
-[error] Invalid override. The type of Window.postMessage ((dynamic, String, [List<MessagePort>]) → void) is not a subtype of WindowBase.postMessage ((dynamic, String, [List<dynamic>]) → void). (dart:html, line 32989, col 3)
-[error] The return type 'String' is not a 'void', as defined by the method ''. (dart:html, line 33901, col 14)
-[error] Invalid override. The type of Worker.onError (() → Stream<Event>) is not a subtype of AbstractWorker.onError (() → Stream<ErrorEvent>). (dart:html, line 34096, col 3)
-[error] Field declaration Node.text cannot be overridden in _Attr. (dart:html, line 34598, col 3)
-[error] Field declaration Node.text= cannot be overridden in _Attr. (dart:html, line 34600, col 3)
-[error] Field declaration DomRectReadOnly.height cannot be overridden in _DomRect. (dart:html, line 35144, col 3)
-[error] Invalid override. The type of _DomRect.height (() → num) is not a subtype of DomRectReadOnly.height (() → double). (dart:html, line 35144, col 3)
-[error] Field declaration DomRectReadOnly.width cannot be overridden in _DomRect. (dart:html, line 35151, col 3)
-[error] Invalid override. The type of _DomRect.width (() → num) is not a subtype of DomRectReadOnly.width (() → double). (dart:html, line 35151, col 3)
-[error] Field declaration DomRectReadOnly.x cannot be overridden in _DomRect. (dart:html, line 35158, col 3)
-[error] Invalid override. The type of _DomRect.x (() → num) is not a subtype of DomRectReadOnly.x (() → double). (dart:html, line 35158, col 3)
-[error] Field declaration DomRectReadOnly.y cannot be overridden in _DomRect. (dart:html, line 35165, col 3)
-[error] Invalid override. The type of _DomRect.y (() → num) is not a subtype of DomRectReadOnly.y (() → double). (dart:html, line 35165, col 3)
-[error] The method '_initMutationEvent' is not defined for the class 'Event'. (dart:html, line 35456, col 11)
-[error] Invalid override. The type of _AttributeMap.containsValue ((String) → bool) is not a subtype of Map<String, String>.containsValue ((Object) → bool). (dart:html, line 36035, col 3)
-[error] The getter 'name' is not defined for the class 'Node'. (dart:html, line 36070, col 32)
-[error] The getter 'value' is not defined for the class 'Node'. (dart:html, line 36082, col 34)
-[error] Invalid override. The type of _ElementAttributeMap.containsKey ((String) → bool) is not a subtype of Map<String, String>.containsKey ((Object) → bool). (dart:html, line 36113, col 3)
-[error] Invalid override. The type of _ElementAttributeMap.[] ((String) → String) is not a subtype of Map<String, String>.[] ((Object) → String). (dart:html, line 36117, col 3)
-[error] Invalid override. The type of _ElementAttributeMap.remove ((String) → String) is not a subtype of Map<String, String>.remove ((Object) → String). (dart:html, line 36125, col 3)
-[error] Invalid override. The type of _NamespacedAttributeMap.containsKey ((String) → bool) is not a subtype of Map<String, String>.containsKey ((Object) → bool). (dart:html, line 36150, col 3)
-[error] Invalid override. The type of _NamespacedAttributeMap.[] ((String) → String) is not a subtype of Map<String, String>.[] ((Object) → String). (dart:html, line 36154, col 3)
-[error] Invalid override. The type of _NamespacedAttributeMap.remove ((String) → String) is not a subtype of Map<String, String>.remove ((Object) → String). (dart:html, line 36162, col 3)
-[error] Invalid override. The type of _DataAttributeMap.containsValue ((String) → bool) is not a subtype of Map<String, String>.containsValue ((Object) → bool). (dart:html, line 36196, col 3)
-[error] Invalid override. The type of _DataAttributeMap.containsKey ((String) → bool) is not a subtype of Map<String, String>.containsKey ((Object) → bool). (dart:html, line 36198, col 3)
-[error] Invalid override. The type of _DataAttributeMap.[] ((String) → String) is not a subtype of Map<String, String>.[] ((Object) → String). (dart:html, line 36200, col 3)
-[error] Invalid override. The type of _DataAttributeMap.remove ((String) → String) is not a subtype of Map<String, String>.remove ((Object) → String). (dart:html, line 36209, col 3)
-[error] Invalid override. The type of CssClassSet.contains ((String) → bool) is not a subtype of Set<String>.contains ((Object) → bool). (dart:html, line 36522, col 3)
-[error] Invalid override. The type of CssClassSet.removeAll ((Iterable<String>) → void) is not a subtype of Set<String>.removeAll ((Iterable<Object>) → void). (dart:html, line 36574, col 3)
-[error] The getter 'value' is not defined for the class 'num'. (dart:html, line 36621, col 21)
-[error] A value of type 'Dimension' cannot be assigned to a variable of type 'num' (dart:html, line 36621, col 44)
-[error] The getter 'value' is not defined for the class 'num'. (dart:html, line 36639, col 20)
-[error] A value of type 'Dimension' cannot be assigned to a variable of type 'num' (dart:html, line 36639, col 42)
-[error] Field declaration MutableRectangle<num>.left cannot be overridden in CssRect. (dart:html, line 36754, col 3)
-[error] Field declaration MutableRectangle<num>.top cannot be overridden in CssRect. (dart:html, line 36756, col 3)
-[error] Invalid override. The type of _ElementCssClassSet.removeAll ((Iterable<String>) → void) is not a subtype of CssClassSetImpl.removeAll ((Iterable<Object>) → void). (dart:html, line 36973, col 3)
-[error] Invalid override. The type of _ElementCssClassSet.retainAll ((Iterable<String>) → void) is not a subtype of CssClassSetImpl.retainAll ((Iterable<Object>) → void). (dart:html, line 36977, col 3)
-[error] Invalid override. The type of _ElementCssClassSet.retainAll ((Iterable<String>) → void) is not a subtype of Set<String>.retainAll ((Iterable<Object>) → void). (dart:html, line 36977, col 3)
-[error] Invalid override. The type of _EventStream.asBroadcastStream (({onListen: (StreamSubscription<dynamic>) → void, onCancel: (StreamSubscription<dynamic>) → void}) → Stream<T>) is not a subtype of Stream<T>.asBroadcastStream (({onListen: (StreamSubscription<T>) → void, onCancel: (StreamSubscription<T>) → void}) → Stream<T>). (dart:html, line 37327, col 3)
-[error] Missing concrete implementation of 'Stream.asBroadcastStream' (dart:html, line 37346, col 7)
-[error] Base class introduces an invalid override. The type of _EventStream.asBroadcastStream (({onListen: (StreamSubscription<dynamic>) → void, onCancel: (StreamSubscription<dynamic>) → void}) → Stream<T>) is not a subtype of Stream<T>.asBroadcastStream (({onListen: (StreamSubscription<T>) → void, onCancel: (StreamSubscription<T>) → void}) → Stream<T>). (dart:html, line 37346, col 48)
-[error] The method 'matchesWithAncestors' is not defined for the class 'EventTarget'. (dart:html, line 37352, col 31)
-[error] The method 'matchesWithAncestors' is not defined for the class 'EventTarget'. (dart:html, line 37376, col 31)
-[error] Invalid override. The type of _ElementListEventStreamImpl.asBroadcastStream (({onListen: (StreamSubscription<dynamic>) → void, onCancel: (StreamSubscription<dynamic>) → void}) → Stream<T>) is not a subtype of Stream<T>.asBroadcastStream (({onListen: (StreamSubscription<T>) → void, onCancel: (StreamSubscription<T>) → void}) → Stream<T>). (dart:html, line 37402, col 3)
-[error] Invalid override. The type of _ElementListEventStreamImpl.asBroadcastStream (({onListen: (StreamSubscription<dynamic>) → void, onCancel: (StreamSubscription<dynamic>) → void}) → Stream<T>) is not a subtype of Stream<T>.asBroadcastStream (({onListen: (StreamSubscription<T>) → void, onCancel: (StreamSubscription<T>) → void}) → Stream<T>). (dart:html, line 37402, col 3)
-[error] Invalid override. The type of _CustomEventStreamImpl.asBroadcastStream (({onListen: (StreamSubscription<dynamic>) → void, onCancel: (StreamSubscription<dynamic>) → void}) → Stream<T>) is not a subtype of Stream<T>.asBroadcastStream (({onListen: (StreamSubscription<T>) → void, onCancel: (StreamSubscription<T>) → void}) → Stream<T>). (dart:html, line 37518, col 3)
-[error] Invalid override. The type of _CustomEventStreamImpl.asBroadcastStream (({onListen: (StreamSubscription<dynamic>) → void, onCancel: (StreamSubscription<dynamic>) → void}) → Stream<T>) is not a subtype of Stream<T>.asBroadcastStream (({onListen: (StreamSubscription<T>) → void, onCancel: (StreamSubscription<T>) → void}) → Stream<T>). (dart:html, line 37518, col 3)
-[error] Missing concrete implementation of 'Stream.asBroadcastStream' (dart:html, line 37529, col 7)
-[error] Base class introduces an invalid override. The type of _CustomEventStreamImpl.asBroadcastStream (({onListen: (StreamSubscription<dynamic>) → void, onCancel: (StreamSubscription<dynamic>) → void}) → Stream<KeyEvent>) is not a subtype of Stream<KeyEvent>.asBroadcastStream (({onListen: (StreamSubscription<KeyEvent>) → void, onCancel: (StreamSubscription<KeyEvent>) → void}) → Stream<KeyEvent>). (dart:html, line 37529, col 33)
-[error] The return type '_EventStream<Event>' is not a 'Stream<T>', as defined by the method 'forTarget'. (dart:html, line 37610, col 12)
-[error] The return type '_ElementEventStreamImpl<Event>' is not a 'ElementStream<T>', as defined by the method 'forElement'. (dart:html, line 37614, col 12)
-[error] The return type '_ElementListEventStreamImpl<Event>' is not a 'ElementStream<T>', as defined by the method '_forElementList'. (dart:html, line 37619, col 12)
-[error] super call must be last in an initializer list (see https://goo.gl/EY6hDP): super(_EVENT_TYPE) (dart:html, line 39057, col 38)
-[error] The getter '_shadowCharCode' is not defined for the class 'KeyboardEvent'. (dart:html, line 39090, col 21)
-[error] The getter '_shadowCharCode' is not defined for the class 'KeyboardEvent'. (dart:html, line 39095, col 47)
-[error] super call must be last in an initializer list (see https://goo.gl/EY6hDP): super(uriPolicy, allowedElements: allowedElements, allowedAttributes: allowedAttributes, allowedUriAttributes: allowedUriAttributes) (dart:html, line 39753, col 7)
-[error] super call must be last in an initializer list (see https://goo.gl/EY6hDP): super(null, allowedElements: ['TEMPLATE'], allowedAttributes: _TEMPLATE_ATTRS.map((attr) => 'TEMPLATE::$attr')) (dart:html, line 39790, col 7)
-[error] The function 'setNativeSubclassDispatchRecord' is not defined. (dart:html, line 40083, col 5)
-[error] The function 'convertDartClosureToJS' is not defined. (dart:html, line 40111, col 7)
-[error] The function 'convertDartClosureToJS' is not defined. (dart:html, line 40121, col 7)
-[error] The function 'findInterceptorConstructorForType' is not defined. (dart:html, line 40140, col 26)
-[error] The function 'findConstructorForNativeSubclassType' is not defined. (dart:html, line 40147, col 21)
-[error] The function 'getNativeInterceptor' is not defined. (dart:html, line 40154, col 3)
-[error] The function 'findDispatchTagForInterceptorClass' is not defined. (dart:html, line 40156, col 26)
-[error] The function 'setNativeSubclassDispatchRecord' is not defined. (dart:html, line 40190, col 3)
-[error] The method 'findInterceptorConstructorForType' is not defined for the class '_JSElementUpgrader'. (dart:html, line 40213, col 28)
-[error] The method 'findConstructorForNativeSubclassType' is not defined for the class '_JSElementUpgrader'. (dart:html, line 40218, col 20)
-[error] The method 'getNativeInterceptor' is not defined for the class '_JSElementUpgrader'. (dart:html, line 40225, col 5)
-[error] The method 'findDispatchTagForInterceptorClass' is not defined for the class '_JSElementUpgrader'. (dart:html, line 40227, col 25)
-[error] The method 'setNativeSubclassDispatchRecord' is not defined for the class '_JSElementUpgrader'. (dart:html, line 40257, col 5)
-[error] The method 'makeLeafDispatchRecord' is not defined for the class 'KeyEvent'. (dart:html, line 40462, col 12)
-[error] The method 'setDispatchProperty' is not defined for the class 'KeyEvent'. (dart:html, line 40532, col 5)
-[error] The method 'matches' is not defined for the class 'EventTarget'. (dart:html, line 40708, col 18)
-[error] The getter 'parent' is not defined for the class 'EventTarget'. (dart:html, line 40709, col 23)
-[error] The getter 'parent' is not defined for the class 'EventTarget'. (dart:html, line 40710, col 56)
+[error] The method 'convertDartClosureToJS' is not defined for the class 'HttpRequest'. (dart:html, line 19547, col 33)
+[error] The method 'convertDartClosureToJS' is not defined for the class 'HttpRequest'. (dart:html, line 19551, col 34)
+[error] The method 'convertDartClosureToJS' is not defined for the class 'MutationObserver'. (dart:html, line 24251, col 9)
+[error] The function 'setNativeSubclassDispatchRecord' is not defined. (dart:html, line 42736, col 5)
+[error] The function 'convertDartClosureToJS' is not defined. (dart:html, line 42764, col 7)
+[error] The function 'convertDartClosureToJS' is not defined. (dart:html, line 42774, col 7)
+[error] The function 'findInterceptorConstructorForType' is not defined. (dart:html, line 42793, col 26)
+[error] The function 'findConstructorForNativeSubclassType' is not defined. (dart:html, line 42800, col 21)
+[error] The function 'getNativeInterceptor' is not defined. (dart:html, line 42807, col 3)
+[error] The function 'findDispatchTagForInterceptorClass' is not defined. (dart:html, line 42809, col 26)
+[error] The function 'setNativeSubclassDispatchRecord' is not defined. (dart:html, line 42843, col 3)
+[error] The method 'findInterceptorConstructorForType' is not defined for the class '_JSElementUpgrader'. (dart:html, line 42866, col 28)
+[error] The method 'findConstructorForNativeSubclassType' is not defined for the class '_JSElementUpgrader'. (dart:html, line 42871, col 20)
+[error] The method 'getNativeInterceptor' is not defined for the class '_JSElementUpgrader'. (dart:html, line 42878, col 5)
+[error] The method 'findDispatchTagForInterceptorClass' is not defined for the class '_JSElementUpgrader'. (dart:html, line 42880, col 25)
+[error] The method 'setNativeSubclassDispatchRecord' is not defined for the class '_JSElementUpgrader'. (dart:html, line 42910, col 5)
+[error] The method 'makeLeafDispatchRecord' is not defined for the class 'KeyEvent'. (dart:html, line 43115, col 12)
+[error] The method 'setDispatchProperty' is not defined for the class 'KeyEvent'. (dart:html, line 43185, col 5)
 [error] The function 'convertDartClosureToJS' is not defined. (dart:html_common/conversions_dart2js.dart, line 89, col 14)
 [error] The function 'convertDartClosureToJS' is not defined. (dart:html_common/conversions_dart2js.dart, line 90, col 15)
-[error] Invalid override. The type of CssClassSetImpl.map (((String) → dynamic) → Iterable<dynamic>) is not a subtype of IterableBase<String>.map (<T>((String) → T) → Iterable<T>). (dart:html_common/css_class_set.dart, line 59, col 3)
-[error] Invalid override. The type of CssClassSetImpl.expand (((String) → Iterable<dynamic>) → Iterable<dynamic>) is not a subtype of IterableBase<String>.expand (<T>((String) → Iterable<T>) → Iterable<T>). (dart:html_common/css_class_set.dart, line 63, col 3)
-[error] Invalid override. The type of CssClassSetImpl.fold ((dynamic, (dynamic, String) → dynamic) → dynamic) is not a subtype of IterableBase<String>.fold (<T>(T, (T, String) → T) → T). (dart:html_common/css_class_set.dart, line 79, col 3)
-[error] Invalid override. The type of CssClassSetImpl.difference ((Set<String>) → Set<String>) is not a subtype of Set<String>.difference ((Set<Object>) → Set<String>). (dart:html_common/css_class_set.dart, line 186, col 3)
-[error] The argument type 'List<Node>' cannot be assigned to the parameter type 'Iterable<Element>'. (dart:html_common/filtered_element_list.dart, line 34, col 25)
 [error] The argument type 'Iterable<E>' cannot be assigned to the parameter type 'Iterable<int>'. (dart:js, line 424, col 40)
 [error] Field declaration Element.title cannot be overridden in StyleElement. (dart:svg, line 4732, col 3)
 [error] Field declaration Element.title= cannot be overridden in StyleElement. (dart:svg, line 4734, col 3)
@@ -429,68 +224,46 @@
 [warning] Unsound implicit cast from Iterable<int> to List<dynamic> (dart:core/string.dart, line 121, col 17)
 [warning] Unsound implicit cast from List<dynamic> to Iterable<int> (dart:core/uri.dart, line 1278, col 37)
 [warning] Unsound implicit cast from List<dynamic> to List<int> (dart:core/uri.dart, line 2023, col 12)
-[warning] The final variable 'origin' must be initialized (dart:html, line 180, col 3)
-[warning] The final variable 'origin' must be initialized (dart:html, line 747, col 3)
-[warning] The final variables 'form', 'labels' and '3' more must be initialized (dart:html, line 1378, col 3)
-[warning] Unsound implicit cast from dynamic to List<num> (dart:html, line 2396, col 14)
-[warning] Unsound implicit cast from dynamic to List<num> (dart:html, line 2398, col 14)
-[warning] The final variable 'options' must be initialized (dart:html, line 8257, col 3)
-[warning] Unsound implicit cast from List<dynamic> to Iterable<Element> (dart:html, line 9949, col 21)
-[warning] Unsound implicit cast from (dynamic) → bool to (Element) → bool (dart:html, line 11089, col 41)
-[warning] The final variables '_attributes', '_childElementCount' and '20' more must be initialized (dart:html, line 12317, col 3)
-[warning] Unsound implicit cast from List<dynamic> to Iterable<Element> (dart:html, line 12525, col 21)
-[warning] Unsound implicit cast from List<dynamic> to Iterable<Map<String, dynamic>> (dart:html, line 12759, col 25)
-[warning] The final variables 'elements', 'form' and '4' more must be initialized (dart:html, line 15820, col 3)
-[warning] The final variable 'length' must be initialized (dart:html, line 16719, col 3)
-[warning] Unsound implicit cast from dynamic to Stream<Geoposition> (dart:html, line 16996, col 12)
-[warning] The final variable '_get_contentWindow' must be initialized (dart:html, line 19230, col 3)
-[warning] The final variables 'complete', 'currentSrc' and '2' more must be initialized (dart:html, line 19368, col 3)
-[warning] The final variables '_get_valueAsDate', 'entries' and '6' more must be initialized (dart:html, line 19497, col 3)
-[warning] The final variables 'form', 'labels' and '4' more must be initialized (dart:html, line 20523, col 3)
-[warning] The final variables 'control' and 'form' must be initialized (dart:html, line 20629, col 3)
-[warning] The final variable 'form' must be initialized (dart:html, line 20663, col 3)
-[warning] The final variables 'import', 'sheet' and '1' more must be initialized (dart:html, line 20689, col 3)
-[warning] The final variable 'areas' must be initialized (dart:html, line 20887, col 3)
-[warning] The final variables 'audioDecodedByteCount', 'audioTracks' and '15' more must be initialized (dart:html, line 21092, col 3)
-[warning] The final variable 'labels' must be initialized (dart:html, line 22428, col 3)
-[warning] The final variables '_localName', '_namespaceUri' and '12' more must be initialized (dart:html, line 23805, col 3)
-[warning] The final variables 'form', 'validationMessage' and '2' more must be initialized (dart:html, line 24598, col 3)
-[warning] The final variables 'form' and 'index' must be initialized (dart:html, line 24733, col 3)
-[warning] The final variables 'form', 'htmlFor' and '5' more must be initialized (dart:html, line 24787, col 3)
-[warning] The final variables 'labels' and 'position' must be initialized (dart:html, line 25757, col 3)
-[warning] The final variables 'form', 'labels' and '4' more must be initialized (dart:html, line 27207, col 3)
-[warning] Unsound implicit cast from List<dynamic> to Iterable<String> (dart:html, line 28908, col 12)
-[warning] Unsound implicit cast from List<dynamic> to Iterable<String> (dart:html, line 28914, col 12)
-[warning] The final variable 'sheet' must be initialized (dart:html, line 29134, col 3)
-[warning] The final variable 'cellIndex' must be initialized (dart:html, line 29256, col 3)
-[warning] The final variables '_rows' and '_tBodies' must be initialized (dart:html, line 29367, col 3)
-[warning] The final variables '_cells', 'rowIndex' and '1' more must be initialized (dart:html, line 29477, col 3)
-[warning] The final variable '_rows' must be initialized (dart:html, line 29544, col 3)
-[warning] The final variable 'content' must be initialized (dart:html, line 29587, col 3)
-[warning] The final variables 'form', 'labels' and '5' more must be initialized (dart:html, line 29663, col 3)
-[warning] The final variables 'readyState' and 'track' must be initialized (dart:html, line 30616, col 3)
-[warning] The final variables 'decodedFrameCount', 'droppedFrameCount' and '2' more must be initialized (dart:html, line 31146, col 3)
-[warning] Unsound implicit cast from dynamic to List<String> (dart:html, line 31593, col 58)
-[warning] Unsound implicit cast from dynamic to (num) → void (dart:html, line 32043, col 35)
-[warning] Unsound implicit cast from Stream<dynamic> to Stream<BeforeUnloadEvent> (dart:html, line 33904, col 12)
-[warning] Unsound implicit cast from dynamic to Rectangle<num> (dart:html, line 34858, col 12)
-[warning] Unsound implicit cast from dynamic to Rectangle<num> (dart:html, line 34873, col 14)
-[warning] Unsound implicit cast from dynamic to Rectangle<num> (dart:html, line 34881, col 14)
-[warning] Unsound implicit cast from dynamic to Rectangle<num> (dart:html, line 34889, col 14)
-[warning] Unsound implicit cast from dynamic to List<Element> (dart:html, line 36661, col 20)
-[warning] Unsound implicit cast from StreamSubscription<dynamic> to StreamSubscription<T> (dart:html, line 37390, col 12)
-[warning] Unsound implicit cast from StreamSubscription<dynamic> to StreamSubscription<T> (dart:html, line 37399, col 12)
-[warning] Unsound implicit cast from dynamic to (Event) → dynamic (dart:html, line 37469, col 44)
-[warning] Unsound implicit cast from dynamic to (Event) → dynamic (dart:html, line 37475, col 47)
-[warning] Unsound implicit cast from dynamic to Iterable<String> (dart:html, line 39536, col 9)
-[warning] Unsound implicit cast from dynamic to Iterable<String> (dart:html, line 39537, col 9)
-[warning] Unsound implicit cast from dynamic to Iterable<String> (dart:html, line 39574, col 9)
-[warning] Unsound implicit cast from dynamic to Iterable<String> (dart:html, line 39575, col 9)
-[warning] Unsound implicit cast from dynamic to E (dart:html, line 39896, col 31)
-[warning] Unsound implicit cast from dynamic to E (dart:html, line 39910, col 28)
-[warning] Unsound implicit cast from List<dynamic> to List<Node> (dart:html, line 39926, col 29)
-[warning] Unsound implicit cast from dynamic to E (dart:html, line 39941, col 20)
-[warning] Unsound implicit cast from (String) → String to (Object) → String (dart:html_common/css_class_set.dart, line 148, col 44)
+[warning] The final variable 'origin' must be initialized (dart:html, line 177, col 3)
+[warning] The final variable 'origin' must be initialized (dart:html, line 813, col 3)
+[warning] Unsound implicit cast from dynamic to List<String> (dart:html, line 1145, col 33)
+[warning] The final variables 'form', 'labels' and '3' more must be initialized (dart:html, line 1691, col 3)
+[warning] Unsound implicit cast from dynamic to List<num> (dart:html, line 2723, col 14)
+[warning] Unsound implicit cast from dynamic to List<num> (dart:html, line 2725, col 14)
+[warning] The final variable 'options' must be initialized (dart:html, line 8973, col 3)
+[warning] The final variables '_attributes', '_childElementCount' and '18' more must be initialized (dart:html, line 13011, col 3)
+[warning] The final variables 'elements', 'form' and '4' more must be initialized (dart:html, line 16630, col 3)
+[warning] The final variable 'length' must be initialized (dart:html, line 17560, col 3)
+[warning] The final variables '_get_contentWindow' and 'sandbox' must be initialized (dart:html, line 20118, col 3)
+[warning] The final variables 'complete', 'currentSrc' and '2' more must be initialized (dart:html, line 20251, col 3)
+[warning] The final variables '_get_valueAsDate', 'entries' and '6' more must be initialized (dart:html, line 20405, col 3)
+[warning] The final variables 'form', 'labels' and '4' more must be initialized (dart:html, line 21441, col 3)
+[warning] The final variables 'control' and 'form' must be initialized (dart:html, line 21552, col 3)
+[warning] The final variable 'form' must be initialized (dart:html, line 21586, col 3)
+[warning] The final variables 'import', 'sheet' and '1' more must be initialized (dart:html, line 21612, col 3)
+[warning] The final variable 'areas' must be initialized (dart:html, line 21764, col 3)
+[warning] The final variables 'audioDecodedByteCount', 'audioTracks' and '16' more must be initialized (dart:html, line 21990, col 3)
+[warning] The final variable 'labels' must be initialized (dart:html, line 23506, col 3)
+[warning] The final variables '_localName', '_namespaceUri' and '12' more must be initialized (dart:html, line 24944, col 3)
+[warning] The final variables 'form', 'validationMessage' and '2' more must be initialized (dart:html, line 25825, col 3)
+[warning] The final variables 'form' and 'index' must be initialized (dart:html, line 25960, col 3)
+[warning] The final variables 'form', 'htmlFor' and '5' more must be initialized (dart:html, line 26014, col 3)
+[warning] The final variables 'labels' and 'position' must be initialized (dart:html, line 27420, col 3)
+[warning] The final variables 'form', 'labels' and '4' more must be initialized (dart:html, line 29191, col 3)
+[warning] The final variable 'sheet' must be initialized (dart:html, line 31447, col 3)
+[warning] The final variable 'cellIndex' must be initialized (dart:html, line 31667, col 3)
+[warning] The final variables '_rows' and '_tBodies' must be initialized (dart:html, line 31778, col 3)
+[warning] The final variables '_cells', 'rowIndex' and '1' more must be initialized (dart:html, line 31888, col 3)
+[warning] The final variable '_rows' must be initialized (dart:html, line 31955, col 3)
+[warning] The final variable 'content' must be initialized (dart:html, line 31998, col 3)
+[warning] The final variables 'form', 'labels' and '5' more must be initialized (dart:html, line 32074, col 3)
+[warning] The final variables 'readyState' and 'track' must be initialized (dart:html, line 33061, col 3)
+[warning] The final variables 'decodedFrameCount', 'droppedFrameCount' and '2' more must be initialized (dart:html, line 33759, col 3)
+[warning] Unsound implicit cast from dynamic to Rectangle<num> (dart:html, line 37623, col 14)
+[warning] Unsound implicit cast from dynamic to Rectangle<num> (dart:html, line 37631, col 14)
+[warning] Unsound implicit cast from dynamic to Rectangle<num> (dart:html, line 37639, col 14)
+[warning] Unsound implicit cast from (T) → void to (Event) → dynamic (dart:html, line 40095, col 67)
+[warning] Unsound implicit cast from (T) → void to (Event) → dynamic (dart:html, line 40117, col 45)
 [warning] Unsound implicit cast from Future<dynamic> to Future<Database> (dart:indexed_db, line 548, col 14)
 [warning] Unsound implicit cast from (dynamic) → void to (Event) → void (dart:indexed_db, line 561, col 34)
 [warning] Unsound implicit cast from Future<dynamic> to Future<IdbFactory> (dart:indexed_db, line 568, col 14)