Since <shadow> will have to do almost the same thing for <content>, it's natural that InsertionPoint::attach() has the same code as HTMLContentElemetn::attach().
Created attachment 130063 [details]
Comment on attachment 130063 [details]
View in context: https://bugs.webkit.org/attachment.cgi?id=130063&action=review
> + elements. So it is natural that InsertionPoint::attach() has such code.
Doesn't need "so". Could be single sentence?
Created attachment 130064 [details]
Patch for landing
Committed r109718: <http://trac.webkit.org/changeset/109718>