HTML benefits from the fact that browsers have always bent over backwards to make sense of whatever freak noise they're fed. Try the same with your average comp

HTML benefits from the fact that browsers have always bent over backwards to make sense of whatever freak noise they're fed. Try the same with your average compiler/interpreter and it'll send you right back to your desk with a list of admonishments. Trouble is, those admonishments change, and require updates. The HTML inside a PHP program from 2005 probably works, but the PHP probably doesn't.