<gold-phone-input> is a single-line text field with Material Design styling
for entering a phone number.
<gold-phone-input></gold-phone-input>It may include an optional label, which by default is "Phone number".
<gold-phone-input label="call this"></gold-phone-input>By default, the phone number is considered to be a US phone number, and
will be validated according to the pattern XXX-XXX-XXXX, where X is a
digit, and - is the separating dash. If you want to customize the input
for a different area code or number pattern, use the country-code and
phone-number-pattern attributes
<gold-phone-input
country-code="33"
phone-number-pattern="X-XX-XX-XX-XX">
</gold-phone-input>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.
--gold-phone-input-country-code | Mixin applied to the country code span