Can you require two form fields to match with HTML5?

Question

Is there a way to require the entries in two form fields to match using HTML5? Or does this still have to be done with javascript? For example, if you have two password fiel

Answer 1

JavaScript will be required, but the amount of code can be kept to a minimum by using an intermediary

element and an oninput form handler to perform the comparison (patterns and validation could augment this solution, but aren't shown here for sake of simplicity):