Invalid error "Attribute allowfullscreen not allowed on element iframe at this point"

Seems to me that allowfullscreen is a valid HTML5 attribute according to:
https://dvcs.w3.org/hg/fullscreen/raw-file/tip/Overview.html#security-and-privacy-considerations

URL: http://beta.flailingmonkey.com/firefox-devtools-api

The validator shows:
Attribute allowfullscreen not allowed on element iframe at this point.

/Mike Ratcliffe

Received on Saturday, 6 April 2013 15:25:15 UTC