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Facebook Connect and their "Social Widgets" documentation mention that you need to add an xmlns attribute to your <html> tag on the page where it will be used.
I understand that xmlns is for XML Name-spacing, and have used such with XHTML before. However, with all the recent talk about HTML4 / HTML5, without having read through the entire spec, is the xmlns attribute compatible with valid HTML5? What about HTML4?
If I've looked over an obvious mention of this in the docs, I'm sorry... point it out?
EDIT: A couple docs references/cites:
http://developers.facebook.com/news.php?blog=1&story=198
https://developers.facebook.com/docs/guides/web
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I've had the same problem using HTML5 for facebook connect and solved with a small hack on Facebook's JavaScript API.
Read my blog: http://fbml5.blogspot.com/
The method on the dev wiki (mentioned by Jesus Saldivar) has two things which I don't like:
Please tell me what you think of it.
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Actually, the first cited reference discusses adding a xmlns:fb="http://www.facebook.com/2008/fbml" attribute. This is not valid HTML5. It is valid XHTML5. The second cited reference does not mention an xmlns attribute at all.
Note though, that although it is not valid HTML4 or HTML5, it will do no harm.
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