Re: [w3c/payment-request] Add regionCode attribute (#690)

marcoscaceres commented on this pull request.



> +                      <li>Two <a>code points</a> that match an [[!ISO3166-1]]
+                      alpha-2 country code.
+                      </li>
+                      <li>A single U+002D (-) <a>code point</a>.
+                      </li>
+                      <li>One, two, or three <a data-cite=
+                      "INFRA#ascii-alphanumeric">ASCII alphanumeric</a> code
+                      points, in any order.
+                      </li>
+                    </ul>
+                  </div>
+                </li>
+                <li>Set <var>address</var>.<a>[[\regionCode]]</a> to
+                <var>regionCode</var>.
+                </li>
+                <li>Let <var>region</var> be the corresponding <a>country

> As a web developer I would expect regionCode to be "CA" for California, not "US-CA"

With the information I have at the moment, I'm leaning towards just returning the ISO3166-2 format. It might save us from having to deal with special cases where there is ambiguity, but I also don't know if there are any. I'll try to do a bit more reading.  

> I'm not sure if there are exceptions to cutting off the first 3 characters in order to get the region code specific to the country.

I don't think there are, from my reading of the ISO3166-2 spec. But I'll take a closer look as it's been a few weeks. 

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