Updating Element.scrollIntoView to be platform independent.

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 600 matching lines @@
 
     testUnsupported('removeRange', () => getQueryAll().removeRange(0, 1));
 
     testUnsupported('insertangeRange', () => getQueryAll().insertRange(0, 1));
 
     testUnsupported('clear', () => getQueryAll().clear());
 
     testUnsupported('removeLast', () => getQueryAll().removeLast());
   });
 
+  group('functional', () {
+    test('scrollIntoView', () {
+      var child = new DivElement();
+      document.body.append(child);
+      child.style.height = '10px';
+      child.style.marginTop = '200px';
+
+      expect(() {
+        child.scrollIntoView(alignCenter: true, alignTop: true);
+      }, throws);
+      expect(() {
+        child.scrollIntoView(alignCenter: true, alignBottom: true);
+      }, throws);
+      expect(() {
+        child.scrollIntoView(alignTop: true, alignBottom: true);
+      }, throws);
+
+      child.scrollIntoView(alignTop: true);
+      child.scrollIntoView(alignCenter: true);
+      child.scrollIntoView(alignBottom: true);
+      child.scrollIntoView();
+    });
+  });
+
   group('_ElementList', () {
     List<Element> makeElList() => makeElementWithChildren().children;
 
     test('where', () {
       var filtered = makeElList().where((n) => n is ImageElement);
       expect(filtered.length, 1);
       expect(filtered.first, isImageElement);
       expect(filtered, isElementIterable);
     });
 
     test('getRange', () {
       var range = makeElList().getRange(1, 2);
       expect(range, isElementList);
       expect(range[0], isImageElement);
       expect(range[1], isInputElement);
     });
   });
 }