title: HTML5 attribute for ZK
body: <p>I have some html5 written which i need to re-implement for a ZK6 application.</p>
  
  <p>I am struggling with the data-* attribute. </p>
  
  <p>For example</p>
  
  <pre><code> &lt;div class="caption lft"
                                   data-x="140"
                                   data-y="60"
                                   data-speed="900"
                                   data-start="800"
                                   data-easing="Sine.easeOut"&gt; &lt;h:img id="tp-mainImgSlide-02" src="img/slider/pic1.png" alt=""/&gt; 
                                   &lt;/div&gt;
  </code></pre>
  
  <p>I get the error </p>
  
  <pre><code>Cause: Method setData-x not found for class org.zkoss.zul.Div
  </code></pre>
  
  <p>Has anyone encountered this issue with HTML5 in ZK 6 and do you know how to resolve?</p>