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

A simple solution with minimal javascript is to use the html attribute pattern (supported by most modern browsers). This works by setting the pattern of the second field to the value of the first field.

Unfortunately, you also need to escape the regex, for which no standard function exists.