Dart SDK Spelling b, c, and d.

runtime/observatory/lib/src/elements/helpers/tag.dart

 // Copyright (c) 2016, 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.
 
 import 'dart:html';
 
 /// Utility class for Custom Tags registration.
 class Tag<T extends HtmlElement> {
   /// Tag name.
   final String name;
 
-  /// Dependend tags that need to be registred for this tag to work properly.
+  /// Dependent tags that need to be registred for this tag to work properly.
   final Iterable<Tag> dependencies;
 
   const Tag(this.name, {this.dependencies: const []});
 
   static final Map<Type, String> _tagByClass = <Type, String>{};
   static final Map<String, Type> _classByTag = <String, Type>{};
 
   /// Ensures that the Tag and all the dependencies are registered.
   void ensureRegistration() {
     if (!_tagByClass.containsKey(T) && !_classByTag.containsKey(name)) {
       document.registerElement(name, T);
       _tagByClass[T] = name;
       _classByTag[name] = T;
       dependencies.forEach((tag) => tag.ensureRegistration());
     }
     var tag = _tagByClass[T];
     if (tag != name) {
       throw new ArgumentError('Class $T is already registered to tag ${tag}');
     }
     var c = _classByTag[name];
     if (c != T) {
       throw new ArgumentError('Tag $name is already registered by class ${c}');
     }
   }
 }