I remember before AOL’s standalone Instant Messenger became popular, mid-1990s, we could go into AOL chat rooms (and Yahoo’s) and throw inline HTML tags into th

I remember before AOL’s standalone Instant Messenger became popular, mid-1990s, we could go into AOL chat rooms (and Yahoo’s) and throw inline HTML tags into the chat box, and they’d affect everything below them until we either sent a closing tag, or enough posts came through to finally push it off the top of the screen. It’s kind of wild how long it took them to implement even very basic protections.