data:text/html, <html contenteditable><script>var t=prompt("what shall we name this file?","new");document.title=t;</script> ^ you can now hit ctrl+s to save t

data:text/html, <html contenteditable><script>var t=prompt("what shall we name this file?","new");document.title=t;</script> ^ you can now hit ctrl+s to save the file with a real name