Re: [w3c/payment-handler] Add ImageObject dictionary. (#174)

rsolomakhin commented on this pull request.



> @@ -695,6 +695,21 @@
             When called, this method executes the following steps:
           </p>
           <ol>
+            <li>If the <a data-lt="PaymentInstrument.icons">icons</a> member of
+            <var>details</var> is present, then for each <var>icon</var> in
+            <var>details</var>.<a data-lt="PaymentInstrument.icons">icons</a>:
+              <ol>
+                <li>If <var>icon</var>.<a data-lt="ImageObject.type">type</a>
+                is not a <a data-cite="#valid-mime-type">valid MIME type</a> or
+                the value of type is not a supported media format, then return
+                a <a>Promise</a> rejected with a <a>TypeError</a>.
+                </li>
+                <li>If <var>icon</var>.<a data-lt="ImageObject.sizes">sizes</a>
+                is not a <a data-lt="ImageObject.sizes">valid value</a>, then
+                return a <a>Promise</a> rejected with a <a>TypeError</a>.
+                </li>
+              </ol>
+            </li>

I suggest we prohibit relative URLs, because it's not clear how to resolve these into absolute URLs in the context of a service worker.

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