Found the culprit, but it's unlikely to happen: 1.- The characters "> <" need to be present (they are inside the X in Clearfix: 2.- Only breaks when pasting

Found the culprit, but it's unlikely to happen: 1.- The characters "> <" need to be present (they are inside the X in Clearfix: 2.- Only breaks when pasting inline CSS with no enclosing <style>: https://gist.githubusercontent.com/sogen/e2ec898e586a9cb9e335/raw/edc3d9da87218c82bb7bd7957d778b94a3ffb299/gistfile1.txt https://gist.githubusercontent.com/sogen/e2ec898e586a9cb9e33... removing the " > < " makes it work.