gwtquery/gwtquery-core/src/main/java/com/google/gwt/query/QueryMin.gwt.xml

<module>
    <!--
     Include com.google.gwt.query.QueryMin instead of com.google.gwt.query.Query
     if you want small javascript code and you are not using any of the selectors: 
     ".*(:contains|!=|:checked|:not|:nth-|:last-|:only-).*"
     
     Note: that this will increase the number of total permutations. 
     -->
    <inherits name='com.google.gwt.query.Query'/>

    <define-property name="selectorCapability" values="native,js"/>
    <property-provider name="selectorCapability">
        <![CDATA[
         return document.location.href.indexOf("_force_no_native") < 0 &&
                document.querySelectorAll && 
                /native/.test(String(document.querySelectorAll)) ? "native" : "js"; 
        ]]>
    </property-provider>

    <!-- Selector Engines -->
    <replace-with class="com.google.gwt.query.client.impl.SelectorEngineNativeMin">
        <when-type-assignable class="com.google.gwt.query.client.impl.SelectorEngineImpl"/>
        <any>
            <when-property-is name="user.agent" value="gecko1_8"/>
            <when-property-is name="user.agent" value="opera"/>
            <when-property-is name="user.agent" value="safari"/>
        </any>
        <when-property-is name="selectorCapability" value="native"/>
    </replace-with>
    <replace-with class="com.google.gwt.query.client.impl.SelectorEngineCssToXPath">
        <when-type-assignable class="com.google.gwt.query.client.impl.SelectorEngineImpl"/>
        <any>
            <when-property-is name="user.agent" value="gecko1_8"/>
            <when-property-is name="user.agent" value="opera"/>
            <when-property-is name="user.agent" value="safari"/>
        </any>
        <when-property-is name="selectorCapability" value="js"/>
    </replace-with>
    <replace-with class="com.google.gwt.query.client.impl.SelectorEngineNativeMinIE8">
        <when-type-assignable class="com.google.gwt.query.client.impl.SelectorEngineImpl"/>
        <when-property-is name="user.agent" value="ie8"/>
        <when-property-is name="selectorCapability" value="native"/>
    </replace-with>
</module>