Re: [w3c/browser-payment-api] Phone number format (#390)

I took a peek at HTML 5.1 [1] which has this note:

 "Unlike the URL and E-mail types, the Telephone type does not enforce a particular syntax. This is intentional; in practice, telephone number fields tend to be free-form fields, because there are a wide variety of valid phone numbers. Systems that need to enforce a particular format are encouraged to use the pattern attribute or the setCustomValidity() method to hook into the client-side validation mechanism."

Should we proceed similarly?

Ian

[1] https://www.w3.org/TR/html51/sec-forms.html#element-statedef-input-telephone

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