title: What namespace to use to recognize nav tag in JSF 2.x?
body: <p>I was asked to use externally provided css/js for web application I am working (JSF 2.x). When I added nav tag into a foo.xhtml file, IDE (eclipse) generated a warning(?) saying - "Unknown tag (nav)."</p>
  
  <p>The foo.xhtml file has following xml namespaces of taglib at top:</p>
  
  <pre><code>&lt;html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:h="http://java.sun.com/jsf/html"  
  xmlns:ui="http://java.sun.com/jsf/facelets"&gt;
  </code></pre>
  
  <p>I assume html taglib does not understand nav tag which is introduced in html 5. How can I rectify this situation? </p>