user/src/com/google/gwt/user/RichText.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 browser selection.                          -->
<!--                                                                        -->
<module>
  <inherits name="com.google.gwt.core.Core" />
  <inherits name="com.google.gwt.user.UserAgent" />

  <!-- Mozilla-specific implementation -->
  <replace-with
    class="com.google.gwt.user.client.ui.impl.RichTextAreaImplMozilla">
    <when-type-is
      class="com.google.gwt.user.client.ui.impl.RichTextAreaImpl" />
    <when-property-is name="user.agent" value="gecko1_8" />
  </replace-with>

  <!-- Safari-specific implementation -->
  <replace-with
    class="com.google.gwt.user.client.ui.impl.RichTextAreaImplSafari">
    <when-type-is
      class="com.google.gwt.user.client.ui.impl.RichTextAreaImpl" />
    <any>
      <when-property-is name="user.agent" value="safari" />
    </any>
  </replace-with>
</module>