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  <title> attribute_changed_callback_test </title>
  <style>
     .unittest-table { font-family:monospace; border:1px; }
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     .unittest-fail { background: #d55;}
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  <h1> Running attribute_changed_callback_test </h1>
  <script type="text/javascript"
      src="/root_dart/pkg/test_runner/lib/src/test_controller.js"></script>
  %TEST_SCRIPTS%
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