title: How to let Eclipse accept the canvas tag?
body: <p>I installed the Aptana plugin in my Eclipse, and I use canvas tag in my html file. 
  I find that the Eclipse can't recognize the canvas tag, it highlight my canvas tags, and display follow msg:</p>
  
  <blockquote>
    <p>&lt; canvas > is not recognized</p>
  </blockquote>
  
  <p>How can I fix this problem? thx in advance.</p>