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this snippet <audio > <source src="audio/atari.mp3" /> <source src="audio/atari.ogg" /> </audio> produces an error on the validator: Line xxx, Column xx: Element source not allowed as child of element audio in this context. (Suppressing further errors from this subtree.) <source src="audio/go.ogg" /> Contexts in which element source may be used: As a child of a media element, before any flow content or track elements. Content model for element audio: If the element has a src attribute: zero or more track elements, then transparent, but with no media element descendants. If the element does not have a src attribute: one or more source elements, then zero or more track elements, then transparent, but with no media element descendants. yet seems similar to: http://www.whatwg.org/specs/web <video controls autoplay> <source src='video.mp4' type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'> <source src='video.ogv' type='video/ogg; codecs="theora, vorbis"' onerror="fallback(parentNode)"> ... </video>
This source validates correctly in http://validator.nu
This is due to a flub I made a while back and have since fixed in the sources. I've just not pushed the fix out to the W3C validator so far. But I will do that within the next few days, and then change the status on this bug after that.
I just pushed an update to the validator, so this should ow validate as expected if you try it again.