TH̘Ë͖́̉ ͠P̯͍̭O̚N̐Y̡ H̸̡̪̯ͨ͊̽̅̾̎Ȩ̬̩̾͛ͪ̈́̀́͘ ̶̧̨̱̹̭̯ͧ̾ͬC̷̙̲̝͖ͭ̏ͥͮ͟Oͮ͏̮̪̝͍M̲̖͊̒ͪͩͬ̚̚͜Ȇ̴̟̟͙̞ͩ͌͝S̨̥̫͎ ̭ͯ̿̔̀ͅ
This would appear to violate the premise of this famous StackOverflow answer, however this is not parsing as such, only matching or heuristic identification.
Technically, all text is HTML if served to a browser in such a way that the browser chooses to interpret it that way, e.g. using a text/html ...
Submitted by Alice Bevan-mcgregor - a year ago