BTW, typo in your embed code: missing an "http:" in the value of the src attribute. Works after I add that, not without it.
http://jugad2.blogspot.in/2014/03/the-html5lib-python-librar...
Was an issue for me, otherwise I would not have said so, obviously. See my above comment where I said "not without it". Also, I'm aware of this:
http://jugad2.blogspot.in/2014/03/the-protocol-relative-url-...
So it may have been some other issue, but was an issue, for sure.