user/src/com/google/gwt/user/History.gwt.xml

<!--                                                                        -->
<!-- Copyright 2008 Google Inc.                                             -->
<!-- Licensed under the Apache License, Version 2.0 (the "License"); you    -->
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<!-- may obtain a copy of the License at                                    -->
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<!-- http://www.apache.org/licenses/LICENSE-2.0                             -->
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<!-- Unless required by applicable law or agreed to in writing, software    -->
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<!-- Deferred binding rules for browser selection.                          -->
<!--                                                                        -->
<!-- This module is typically inherited via com.google.gwt.user.User        -->
<!--                                                                        -->
<module type="fileset">
  <inherits name="com.google.gwt.core.Core"/>
  <inherits name="com.google.gwt.user.UserAgent"/>

  <!-- IE8 does not work with the standard implementation -->
  <replace-with class="com.google.gwt.user.client.History.HistoryImplIE8">
    <when-type-is class="com.google.gwt.user.client.History.HistoryImpl" />
    <all>
      <!-- prevent fallback for IE9 -->
      <none>
        <when-property-is name="user.agent" value="ie9" />
      </none>
      <when-property-is name="user.agent" value="ie8" />
    </all>
  </replace-with>
</module>