http://www.perlmonks.org?node_id=1190008


in reply to Markup tags should be written in:

Remember PETSCII? On Commodore computers (C64, C128), the SHIFT+COMMODORE key combination switches the codepage between uppercase and lowercase letters. Perversely, shifted means lowercase. But with this kind of a feature, it doesn't matter if you type your tags in uppercase – just SHIFT+COMMODORE to change them all to lowercase.