In one of our latest projects we were asked to implement a video gallery for a famous choreographer, using videos already uploaded in YouTube.
Well, it so appears that the code provided by Youtube fails the validation test with multiple errors, mostly concerning the "embed" element.
Here is the code, as provided by YouTube.
<object width="425" height="344">
<param name="movie" value="http://www.youtube.com/
v/FAM3tyAJ8Vw&hl=en&fs=1"></param>
<param name="allowFullScreen" value="true"></param>