According to HTML5 specification (http://www.w3.org/TR/html5/tree-construction.html#parsing-main-inbody), a start "body" tag in the "in body" insertion mode is a parse error. 8.2.5.4.7 The "in body" insertion mode ... -> A start tag whose tag name is "body" Parse error. If the second element on the stack of open elements is not a body element, or, if the stack of open elements has only one node on it, then ignore the token. (fragment case) Otherwise, set the frameset-ok flag to "not ok"; then, for each attribute on the token, check to see if the attribute is already present on the body element (the second element) on the stack of open elements, and if it is not, add the attribute and its corresponding value to that element.
Created attachment 150399 [details] Patch
Comment on attachment 150399 [details] Patch OK.
Comment on attachment 150399 [details] Patch Clearing flags on attachment: 150399 Committed r121683: <http://trac.webkit.org/changeset/121683>
All reviewed patches have been landed. Closing bug.