In practice things like that did happen, though. e.g. this story of someone's website displaying user-generated content with a character outside their declared

In practice things like that did happen, though. e.g. this story of someone's website displaying user-generated content with a character outside their declared character set: https://web.archive.org/web/20060420051806/http://diveintomark.org/archives/2004/01/14/thought_experiment https://web.archive.org/web/20060420051806/http://diveintoma...