A long time ago the w3c proposed new standards for web forms to supplement the simple first-generation forms. They were heralded as a step forward in web development, but no browser ever implemented them. Their current status in Mozilla:
Comment 111 Robin Whittleton 2013-04-10 06:47:31 PDT
I’m guessing this is a WONTFIX now that they’ve been marked as obsolete on MDN? https://developer.mozilla.org/en/docs/
Comment 112 Benjamin Smedberg [:bsmedberg] 2013-04-10 06:54:28 PDT
Indeed, we would not accept an implementation even if somebody wrote it.