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

<!--                                                                        -->
<!-- Copyright 2007 Google Inc.                                             -->
<!-- Licensed under the Apache License, Version 2.0 (the "License"); you    -->
<!-- may not use this file except in compliance with the License. You may   -->
<!-- may obtain a copy of the License at                                    -->
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<!-- http://www.apache.org/licenses/LICENSE-2.0                             -->
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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"/>

  <!-- Mozilla needs a different implementation due to issue #410 -->
  <replace-with class="com.google.gwt.user.client.ui.impl.PopupImplMozilla">
    <when-type-is class="com.google.gwt.user.client.ui.impl.PopupImpl"/>
    <when-property-is name="user.agent" value="gecko1_8"/>
  </replace-with>

  <!-- IE6 has a completely different popup implementation. It is no longer -->
  <!-- necessary on IE8. -->
  <replace-with class="com.google.gwt.user.client.ui.impl.PopupImplIE6">
    <when-type-is class="com.google.gwt.user.client.ui.impl.PopupImpl"/>
    <when-property-is name="user.agent" value="ie6"/>
  </replace-with>
</module>