I notice that when I check my blog's XHTML validation on the W3C Markup Validation Service, it comes up invalid.
It is all due to the youtube video I included in a post. (If I remove the video, it checks out as valid.)
I think the video is posted correctly, as per the instructions in the FAQ. Have others noticed this? Is it a problem? (I know with some of these "errors" the problem is really with the validation service.) Thanks.