Web Forms 2.0
According to the W3C Submission,
provides new strongly-typed input fields, new attributes for defining constraints, a repeating model for declarative repeating of form sections, new DOM interfaces, new DOM events for validation and dependency tracking, and XML submission and initialization of forms. It also standardises and codifies existing practice in areas that have not been previously documented, and clarifies some of the interactions of HTML form controls and CSS.
Let's look at some of these.