HTML5 Required Check Fails for Fields of Type email

The following field definition fails to validate even though I believe it
is perfectly valid:

<input type="email" name="email" onblur="this.value =
trimBlanks(this,'LeadingSpaces');" required="required" />

Error:
Attribute required is only allowed when the input type is checkbox, date,
datetime, datetime-local, e-mail, file, month, number, password, radio,
search, tel, text, time, url, or week.

A sample URL is:
http://www.torontocriminallawyers.com/criminal-charges/possession-of-stolen-property

Regards,

Scott Sinclair
We Think Solutions <http://www.wethinksolutions.com>
1-800-231-1020 x33