Regular expression validating date Chat sites no registration
The best thing about HTML5 attributes is that they have no effect whatsoever on unsupported browsers, so older versions of Internet Explorer will act as if they are not present and just run the Java Script validation as before.
Some text editors (not just vi) also allow them when searching for or replacing text. This is a new technique available in modern browsers and definitely the way of the future.
A few simple form attributes can have the same effect as reams of Java Script code libraries.
Here we have an enhanced version of the above code where we've added HTML5 handler to the first password field which updates the pattern required by the second password field - in effect forcing them to be identical: Here you can see a screen shot from Safari of the form being completed.
For security a password should never be displayed in HTML or sent by email.
If you're concerned about security you should have some policy on what constitutes a valid password.
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Otherwise your application needs to provide this function.