title: Placeholder tag in stripes framework
body: <p>I'm developing a web application using the stripes framework and I would like to use the 'placeholder' tag within a text box like this:</p>
  
  <pre><code>&lt;s:form beanclass="myproject.action.ContactFormActionBean"&gt;
    &lt;table class="form"&gt;
      &lt;tr&gt;
       &lt;td&gt;Email:&lt;/td&gt;
       &lt;td&gt;&lt;s:text name="contact.email" placeholder="Please enter your email"&gt;&lt;/td&gt;
      &lt;/tr&gt;
    &lt;/table&gt;
  &lt;/s:form&gt;
  </code></pre>
  
  <p>However, when I run the page I get a 500 error (Unexpected error). Looking at the stripes documentation, I see that the placeholder attribute is invalid.</p>
  
  <p>Is there a work around that is available for this or do I need to use another tag library in order for placeholder to work? </p>