• Having the entire page inside a single frame, so the URL at the top doesn't change, but what looks like the page contents does. Has the beneficial side effect that on some platforms (e.g. UN*X) your Netscape PgUp/PgDn keys might not work, and you won't understand why not.
  • The "Back" link. Having passed the age of informed consent, I'm perfectly capable of pressing my browser's "Back" button; and I might not have come from where the designers of the page thought I did.
  • Nonstandard extensions, coupled with nonstandard or plain wrong MIME types. An example is serving HTML with a ".txt" extension, or a text file as text/html.

Note that some of the items on the original list (as well as the third on this list) are actually crimes against HTTP, but we might as well set up just one tribunal.