Renaming Element.dataAttributes to Element.dataset.

tests/html/element_test.dart

 // Copyright (c) 2011, 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.
 
 library ElementTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:async';
 import 'dart:html';
 import 'dart:svg' as svg;
@@ skipping 280 matching lines @@
         final element = new Element.html(
             '''<div class="foo" style="overflow: hidden" data-foo="bar"
                    data-foo2="bar2" dir="rtl">
                </div>''');
         final attributes = element.attributes;
         expect(attributes['class'], 'foo');
         expect(attributes['style'], startsWith('overflow: hidden'));
         expect(attributes['data-foo'], 'bar');
         expect(attributes['data-foo2'], 'bar2');
         expect(attributes.length, 5);
-        expect(element.dataAttributes.length, 2);
-        element.dataAttributes['foo'] = 'baz';
-        expect(element.dataAttributes['foo'], 'baz');
+        expect(element.dataset.length, 2);
+        element.dataset['foo'] = 'baz';
+        expect(element.dataset['foo'], 'baz');
         expect(attributes['data-foo'], 'baz');
         attributes['data-foo2'] = 'baz2';
         expect(attributes['data-foo2'], 'baz2');
-        expect(element.dataAttributes['foo2'], 'baz2');
+        expect(element.dataset['foo2'], 'baz2');
         expect(attributes['dir'], 'rtl');
 
-        final dataAttributes = element.dataAttributes;
-        dataAttributes.remove('foo2');
+        final dataset = element.dataset;
+        dataset.remove('foo2');
         expect(attributes.length, 4);
-        expect(dataAttributes.length, 1);
+        expect(dataset.length, 1);
         attributes.remove('style');
         expect(attributes.length, 3);
-        dataAttributes['foo3'] = 'baz3';
-        expect(dataAttributes.length, 2);
+        dataset['foo3'] = 'baz3';
+        expect(dataset.length, 2);
         expect(attributes.length, 4);
         attributes['style'] = 'width: 300px;';
         expect(attributes.length, 5);
       });
 
       test('namespaces', () {
         var element = new svg.SvgElement.svg(
           '''<svg xmlns="http://www.w3.org/2000/svg"
                   xmlns:xlink="http://www.w3.org/1999/xlink">
             <image xlink:href="foo" data-foo="bar"/>
@@ skipping 313 matching lines @@
     });
 
     test('getRange', () {
       var range = makeElList().getRange(1, 2);
       expect(range, isElementList);
       expect(range[0], isImageElement);
       expect(range[1], isInputElement);
     });
   });
 }