user/super/com/google/gwt/emul/EmulationWithUserAgent.gwt.xml

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<!-- Copyright 2008 Google Inc.                                             -->
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<!-- http://www.apache.org/licenses/LICENSE-2.0                             -->
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<!-- Deferred binding rules for optimized JRE implementations based on user agent. -->
<module>
  <inherits name="com.google.gwt.emul.Emulation"/>

  <!-- If the user agent is known, use Append as the default StringBuffer implementation. -->
  <replace-with class="com.google.gwt.core.client.impl.StringBufferImplAppend">
    <when-type-is class="com.google.gwt.core.client.impl.StringBufferImpl"/>
  </replace-with>

  <!--  Append is awful on IE.  Use Array instead. -->
  <replace-with class="com.google.gwt.core.client.impl.StringBufferImplArray">
    <when-type-is class="com.google.gwt.core.client.impl.StringBufferImpl"/>
    <any>
      <when-property-is name="user.agent" value="ie6"/>
      <when-property-is name="user.agent" value="ie8"/>
      <when-property-is name="user.agent" value="ie9"/>
    </any>
  </replace-with>

  <super-source/>
</module>