Re: [w3c/browser-payment-api] Add support for ShippingOption.selected. (#179)

Is there a plan to include this "default" option for email as well? 

Here's the concern:

Collecting email at the very last step in the shopping process means that email retargeting is an issue (what happens when the customer leaves the cart before hitting "buy" in a guest checkout scenario?).

Some merchants want to be able to easily do email retargeting if a shopping cart is abandoned. This means they'll attempt to collect an email before the customer attempts to checkout (not using the Web Payments Browser API). 

If they then call the Browser API requesting an email address, the customer may get annoyed that they have to specify their email twice. The customer most likely expect to have a default email specified if the merchant knows what it is.


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