Make html metadata follow the spec.

tools/dom/templates/html/impl/impl_HTMLInputElement.darttemplate

 // 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.
 
 part of $LIBRARYNAME;
 
 $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS implements
     HiddenInputElement,
     SearchInputElement,
     TextInputElement,
@@ skipping 290 matching lines @@
   @DomName('HTMLInputElement.stepUp')
   void stepUp([int n]);
 }
 
 /**
  * A date (year, month, day) with no time zone.
  *
  * Use [supported] to check if this is supported on the current platform.
  */
 @SupportedBrowser(SupportedBrowser.CHROME, '25')
-@Experimental
+@Experimental()
 abstract class DateInputElement implements RangeInputElementBase {
   factory DateInputElement() => new InputElement(type: 'date');
 
   @DomName('HTMLInputElement.valueAsDate')
   DateTime valueAsDate;
 
   @DomName('HTMLInputElement.readOnly')
   bool readOnly;
 
   @DomName('HTMLInputElement.required')
   bool required;
 
   /// Returns true if this input type is supported on the current platform.
   static bool get supported {
     return (new InputElement(type: 'date')).type == 'date';
   }
 }
 
 /**
  * A date consisting of a year and a month with no time zone.
  *
  * Use [supported] to check if this is supported on the current platform.
  */
 @SupportedBrowser(SupportedBrowser.CHROME, '25')
-@Experimental
+@Experimental()
 abstract class MonthInputElement implements RangeInputElementBase {
   factory MonthInputElement() => new InputElement(type: 'month');
 
   @DomName('HTMLInputElement.valueAsDate')
   DateTime valueAsDate;
 
   @DomName('HTMLInputElement.readOnly')
   bool readOnly;
 
   @DomName('HTMLInputElement.required')
   bool required;
 
   /// Returns true if this input type is supported on the current platform.
   static bool get supported {
     return (new InputElement(type: 'month')).type == 'month';
   }
 }
 
 /**
  * A date consisting of a week-year number and a week number with no time zone.
  *
  * Use [supported] to check if this is supported on the current platform.
  */
 @SupportedBrowser(SupportedBrowser.CHROME, '25')
-@Experimental
+@Experimental()
 abstract class WeekInputElement implements RangeInputElementBase {
   factory WeekInputElement() => new InputElement(type: 'week');
 
   @DomName('HTMLInputElement.valueAsDate')
   DateTime valueAsDate;
 
   @DomName('HTMLInputElement.readOnly')
   bool readOnly;
 
   @DomName('HTMLInputElement.required')
   bool required;
 
   /// Returns true if this input type is supported on the current platform.
   static bool get supported {
     return (new InputElement(type: 'week')).type == 'week';
   }
 }
 
 /**
  * A time (hour, minute, seconds, fractional seconds) with no time zone.
  *
  * Use [supported] to check if this is supported on the current platform.
  */
 @SupportedBrowser(SupportedBrowser.CHROME)
-@Experimental
+@Experimental()
 abstract class TimeInputElement implements RangeInputElementBase {
   factory TimeInputElement() => new InputElement(type: 'time');
 
   @DomName('HTMLInputElement.valueAsDate')
   DateTime valueAsDate;
 
   @DomName('HTMLInputElement.readOnly')
   bool readOnly;
 
   @DomName('HTMLInputElement.required')
   bool required;
 
   /// Returns true if this input type is supported on the current platform.
   static bool get supported {
     return (new InputElement(type: 'time')).type == 'time';
   }
 }
 
 /**
  * A date and time (year, month, day, hour, minute, second, fraction of a
  * second) with no time zone.
  *
  * Use [supported] to check if this is supported on the current platform.
  */
 @SupportedBrowser(SupportedBrowser.CHROME, '25')
-@Experimental
+@Experimental()
 abstract class LocalDateTimeInputElement implements RangeInputElementBase {
   factory LocalDateTimeInputElement() =>
       new InputElement(type: 'datetime-local');
 
   @DomName('HTMLInputElement.readOnly')
   bool readOnly;
 
   @DomName('HTMLInputElement.required')
   bool required;
 
   /// Returns true if this input type is supported on the current platform.
   static bool get supported {
     return (new InputElement(type: 'datetime-local')).type == 'datetime-local';
   }
 }
 
 /**
  * A numeric editor control.
  */
 @SupportedBrowser(SupportedBrowser.CHROME)
 @SupportedBrowser(SupportedBrowser.IE)
 @SupportedBrowser(SupportedBrowser.SAFARI)
-@Experimental
+@Experimental()
 abstract class NumberInputElement implements RangeInputElementBase {
   factory NumberInputElement() => new InputElement(type: 'number');
 
   @DomName('HTMLInputElement.placeholder')
   String placeholder;
 
   @DomName('HTMLInputElement.readOnly')
   bool readOnly;
 
   @DomName('HTMLInputElement.required')
   bool required;
 
   /// Returns true if this input type is supported on the current platform.
   static bool get supported {
     return (new InputElement(type: 'number')).type == 'number';
   }
 }
 
 /**
  * Similar to [NumberInputElement] but the browser may provide more optimal
  * styling (such as a slider control).
  *
  * Use [supported] to check if this is supported on the current platform.
  */
 @SupportedBrowser(SupportedBrowser.CHROME)
 @SupportedBrowser(SupportedBrowser.IE, '10')
-@Experimental
+@Experimental()
 abstract class RangeInputElement implements RangeInputElementBase {
   factory RangeInputElement() => new InputElement(type: 'range');
 
   /// Returns true if this input type is supported on the current platform.
   static bool get supported {
     return (new InputElement(type: 'range')).type == 'range';
   }
 }
 
 /**
@@ skipping 117 matching lines @@
   factory ResetButtonInputElement() => new InputElement(type: 'reset');
 }
 
 /**
  * A button, with no default behavior.
  */
 abstract class ButtonInputElement implements InputElementBase {
   factory ButtonInputElement() => new InputElement(type: 'button');
 }