Re: [w3c/payment-handler] Add CanMakePaymentEvent. (#170)

marcoscaceres commented on this pull request.



> +            </ol>
+          </li>
+          <li>Otherwise, fire the <a>CanMakePaymentEvent</a> in the payment
+          handler and return the result.
+          </li>
+        </ol>
+        <section id="capabilities-example" class="informative">
+          <h2>
+            How to specify capabilities
+          </h2>
+          <p>
+            Example of how a payment handler should provide the list of all its
+            active cards to the browser.
+          </p>
+          <pre class="example js" title="Specifying capabilities">
+navigator.serviceWorker.register('/pw/app.js').then(function() {

Nit: we should rewrite this using async/await. It will make it much easier to read. 

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