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http://www.w3.org/TR/html5/embedded-content-0.html#the-iframe-element I suggest that the current iframe examples in the html spec of iframe are missing the title attribute with a description of their contents, and therefore does not meet WCAG. See http://www.w3.org/TR/WCAG20-TECHS/H64.html I have an in depth discussion and testing results here. http://davidmacd.com/blog/is-title-attribute-on-iframe-required-by-wcag.html
Moved to HTML on Github: https://github.com/w3c/html/issues/298