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http://www.bluishcoder.co.nz/2009/06/video-for-everybody-html-5-video.html#9069120310304449626 cites <applet> being non-conforming as a reason not to use Cortado as a fallback for <video>. If one wants to serve royalty-free Ogg video using <video> to Firefox 3.5, Chrome 3 and Safari 3.1 or later + XiphQT and still have a fallback for IE and Opera, it seems that it would be useful to be able to use a single no-JavaScript <applet> fallback for both IE and Opera without having a validator whine about it. If one only wants to have a Cortado fallback in IE assuming Opera ships <video> soon enough, one could use <object>, but according to Sun's documentation[1], that alternative required the classid attribute which is also non-conforming in HTML5. Please allow a conforming and easy-to-author way to fall back onto Cortado in desktop browsers that don't support <video>. After all, <video> has *designed* fallback mechanism. It's rather silly if using the mechanism is non-conforming. [1] http://java.sun.com/javase/6/docs/technotes/guides/plugin/developer_guide/using_tags.html
http://damowmow.com/playground/demos/java/001.html
For interested parties, here's a demo that validates and works and doesn't have the extra stuff: http://hsivonen.iki.fi/test/moz/video-fallback-validation/object-type.html