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There's some extra work, but I think it will all be noops. Is it worth it, just for simplicity?
Ok, this isn't just speculative anymore. An example of a case in which doing the full work of In Head is: #data <body><template><template><b><template></template></template>text</template> #errors #document |<html> | <head> | <body> | <template> | #document-fragment | <template> | #document-fragment | <b> | <template> | #document-fragment | "text" In this case, the failure to clear the list of active formatting elements results in the <b> still being on the stack even when its enclosing <template> end tag has been processed.
http://dvcs.w3.org/hg/webcomponents/rev/534ef8dd54e8