If you read the "clone" algorithm in the DOM Core spec, you won't find a normative statement saying that you have to clone the "already started" flag on script elements. To make sure that readers of the spec find the right normative statement, please provide an informative pointer to http://www.whatwg.org/specs/web-apps/current-work/#already-started
Please weasel in some language to suggest that SVG script elements should work consistently with HTML script elements in this regard.
HTML also does this for input elements. Not sure where else. I guess we should try to keep the note exhaustive although that does kind of argue for just writing these things in DOM directly...