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?

1 Answer 1


You need to include the following line in your content.opf file:

<meta property="media:active-class">-epub-media-overlay-active</meta>

Further information and examples can be found on the IDPF's site.

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