##<iban-number>
<iban-number> is a single-line text field with Material Design styling
for entering an email address.
<iban-number></iban-number>It may include an optional label, which by default is "Email".
<iban-number label="your email address"></iban-number>The input can be automatically validated as the user is typing by using
the auto-validate and required attributes. For manual validation, the
element also has a validate() method, which returns the validity of the
input as well sets any appropriate error messages and styles.
See Polymer.PaperInputBehavior for more API docs.
See Polymer.PaperInputContainer for a list of custom properties used to
style this element.