I get this error on the website I'm working on, I simplified the code to the example below, which causes this error in webkit (chrome 15.0.x), I don't see the error in firefox.
I looked at other SO posts regarding the same error, and most of them relate to using the youtube API and cross-references.
I tried:
change doctype, (no difference) adding the original parameters to the youtube call (no difference)
<!DOCTYPE html> <html lang="en" dir="ltr"> <head> <title></title> </head> <body class="page front logged-in no-sidebars"> <iframe width="393" height="230" src="http://www.youtube.com/embed/QH2-TGUlwu4" frameborder="0" ></iframe> </body> </html>
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