<t:border xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd"
          xmlns:p="tapestry:parameter">

<!-- note that since we won't be submitting the form, we can just bind visible parameters to literal values -->
    <t:form>
        <div t:type="formfragment" t:id="outerhide" visible="true">
            <span id="outertext1">Outer Text</span>
            <div t:type="formfragment" t:id="innerhide" visible="true">
                <span id="innertext1">Inner Text</span>
                <t:checkbox t:id="innertrigger1" value="true" t:mixins="triggerfragment" fragment="innerhide"/>
            </div>
        </div>

        <div t:type="formfragment" t:id="outerremove" visible="true">
            <span id="outertext2">Outer Text</span>
            <div t:type="formfragment" t:id="innerremove" visible="true">
                <span id="innertext2">Inner Text</span>
                <t:checkbox t:id="innertrigger2" value="true"/>
            </div>
        </div>
        
    </t:form>
</t:border>