add example

index.html

@@ -824,32 +824,30 @@ <h3>
         </p>
         <p>
           To <dfn>process the `id` member</dfn>, given [=object=]
-          |json:JSON|, [=ordered map=] |manifest:ordered map|, and [=URL=]
-          |document URL:URL|:
+          |json:JSON|, [=ordered map=] |manifest:ordered map|.:
         </p>
         <ol class="algorithm">
           <li>If the type of |json|["id"] is not [=string=], return.
           </li>
-          <li>If |json|["start_url"] is the empty string, return.
-          </li>
           <li>Let |id:URL| be the result of [=URL Parser|parsing=]
-          |json|["id"], using the origin of <var>document URL</var> as the base URL.
+          (<var>start URL's origin</var> + "/" + |json|["id"]).
           </li>
           <li>If |id| is failure, return.
           </li>
-          <li>If |id| is not <a>same origin</a> as <var>document
-          URL</var>, return.
-          </li>
           <li>Otherwise, set |manifest|["id"] to |start URL|.
           </li>
         </ol>
         <aside class="example">
           <p>
-            For example, if the value of [=manifest/start_url=] is
-            <samp>../start_point.html</samp>, and the manifest's URL is
-            <samp>https://example.com/resources/manifest.webmanifest</samp>,
-            then the result of [=URL parser|parsing=] would be
-            <samp>https://example.com/start_point.html</samp>.
+            For example, if the |start URL| is
+            <samp>https://example.com/resources/start</samp>,
+            and the value of [=manifest/id=] is <samp>"1"</samp>, then the
+            processed result is <samp>https://example.com/1</samp>. If the
+            value of [=manifest/id=] is <samp>""</samp>, then the processed
+            result is <samp>https://example.com/</samp>. If [=manifest/id=]
+            not specified, then the processed result is
+            <samp>https://example.com/start</samp>.
+
           </p>
         </aside>
       </section>