tapestry-core/src/test/app1/UnsupportedParameterBlockDemo.tml

<t:border xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd"
          xmlns:p="tapestry:parameter">

    <t:outputraw>
        <p:unexpected>Informal parameter to component that does not support them.</p:unexpected>
    </t:outputraw>
</t:border>