Re: [w3c/manifest] Adding protocol handlers (#972)

@marcoscaceres commented on this pull request.



> +        </p>
+        <p>
+          How protocol handlers are presented, and how many of them are shown
+          to the user, is at the discretion of the user agent and/or operating
+          system.
+        </p>
+        <p>To <dfn>process the `protocol_handlers` member</dfn>, given [=object=] |json:JSON|, |manifest:ordered map|, and |manifest URL:URL|:</p>
+        <ol>
+          <li>Let <var>processedProtocolHandlers</var> be a new [=list=].
+          </li>
+          <li>[=list/For each=] <var>protocol_handler</var> (<a>protocol handler description</a>):
+            <ol>
+              <li>If |protocol_handler|["protocol"] or
+                <var>protocol_handler</var>["url"] is undefined, [=iteration/continue=].
+              </li>
+              <li>Let (<dfn>normalizedProtocol</dfn>, <dfn>normalizedUrl</dfn>) be the result of running <a data-cite="HTML/system-state#normalize-protocol-handler-parameters">normalize protocol handler parameters</a> with <var>protocol_handler</var>["protocol"], <var>protocol_handler</var>["url"] using <var>manifest URL</var> as the base URL, and [=this=]'s relevant [=environment settings object=]. If the result is failure, [=iteration/continue=].</li>

Nit: we will need to get "normalize protocol handler parameters" exported from HTML to use it. 

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