| Index: sdk/lib/html/html_common/filtered_element_list.dart
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| diff --git a/sdk/lib/html/html_common/filtered_element_list.dart b/sdk/lib/html/html_common/filtered_element_list.dart
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| index 63123687d1053cadb5eec7ee50dbe173362def79..ed8e12dc0234cab431cd995c0ce666898428af76 100644
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| --- a/sdk/lib/html/html_common/filtered_element_list.dart
 | 
| +++ b/sdk/lib/html/html_common/filtered_element_list.dart
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| @@ -49,7 +49,7 @@ class FilteredElementList extends ListBase<Element> {
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|      removeRange(newLength, len - newLength);
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|    }
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|  
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| -  String join([String separator]) => _filtered.join(separator);
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| +  String join([String separator = ""]) => _filtered.join(separator);
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|  
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|    void add(Element value) {
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|      _childNodes.add(value);
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| 
 |