| Index: client/html/src/DocumentFragmentWrappingImplementation.dart
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| diff --git a/client/html/src/DocumentFragmentWrappingImplementation.dart b/client/html/src/DocumentFragmentWrappingImplementation.dart
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| index b50ea2aeaf9fa11b70d1412d108e56d71742e3f4..a863dee1dbacb5a9ad04e92fecdf0aff03006656 100644
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| --- a/client/html/src/DocumentFragmentWrappingImplementation.dart
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| +++ b/client/html/src/DocumentFragmentWrappingImplementation.dart
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| @@ -193,8 +193,7 @@ class DocumentFragmentWrappingImplementation extends NodeWrappingImplementation
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|      return _elements;
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|    }
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|  
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| -  // TODO: The type of value should be Collection<Element>. See http://b/5392897
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| -  void set elements(value) {
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| +  void set elements(Collection<Element> value) {
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|      // Copy list first since we don't want liveness during iteration.
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|      List copy = new List.from(value);
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|      final elements = this.elements;
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| 
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