One of the first efforts toward HTML5 was WHATWG’s Web Forms 2.0, originally called XForms Basic. The spec introduced new form controls and validation, among other things. Later, it got incorporated into HTML5, and was subsequently stripped of the repetition model, resulting in what we know today as HTML5 Forms.
The ever-present issue, backward compatibility, still remains a headache though, unfortunately. Developers have to deal with the dreaded Internet Explorer, which, as you might have guessed, doesn’t provide much support for the latest advancement in forms – even in the latest available beta of IE9. Older versions of IE? Fagetaboutit.
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