shippingAddress attribute

Click on each button in sequence from top to bottom without refreshing the page. Each button will bring up the Payment Request UI window.

When prompted, please enter "web platform test" as recipient, at address "1 wpt street" in "Kabul, Afghanistan", zip/postal code 1001.

1. If options is undefined, then shippingAddress must be null.
2. If the requestShipping member is missing, then shippingAddress must be null.
3. If the requestShipping member is false, then shippingAddress must be null.
4. If the requestShipping member is true, then shippingAddress must be "1 wpt street" in "Kabul, Afghanistan", zip code 1001.