title_body: Epub read-along, Highlighting is not working My fixed-layout read-along book is validated finally.  I tested it on the Ipad.  Everything looks fine,  The audio is working fine.  However, there is no word highlighting.  I put this code in the CSS file and the content.opf file.  
  
  .-epub-media-overlay-active {
  color: #f09aec;
  }
  
  
  What else do I need to do?
upvoted_answer: You need to include the following line in your content.opf file:
  
  &lt;meta property="media:active-class"&gt;-epub-media-overlay-active&lt;/meta&gt;
  
  
  Further information and examples can be found on the IDPF's site.