Use image density from fetch in the processing model

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@@ -2798,6 +2798,7 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
        <li><dfn data-x="concept-internal-response" data-x-href="https://fetch.spec.whatwg.org/#concept-internal-response">internal response</dfn></li>
        <li><dfn data-x="concept-response-csp-list" data-x-href="https://fetch.spec.whatwg.org/#concept-response-csp-list">CSP list</dfn></li>
        <li><dfn data-x="concept-response-https-state" data-x-href="https://fetch.spec.whatwg.org/#concept-response-https-state">HTTPS state</dfn></li>
+       <li><dfn data-x="concept-response-location-url" data-x-href="https://fetch.spec.whatwg.org/#concept-response-image-density"><!--TODO(eeeps) hook this up to the PR-->image density</dfn></li>
        <li><dfn data-x="concept-response-location-url" data-x-href="https://fetch.spec.whatwg.org/#concept-response-location-url">location URL</dfn></li>
       </ul>
      </li>
@@ -28056,6 +28057,17 @@ was an English &lt;a href="/wiki/Music_hall">music hall&lt;/a> singer, ...</code
    <li><p>End the <span>synchronous section</span>, continuing the remaining steps <span>in
    parallel</span>, but without missing any data from fetching.</p></li>
 
+   <li>
+
+    <p>If the fetch’s response has an
+    <span data-x="concept-response-image-density">image density</span>, set
+    <span>image request</span>’s <span>current pixel density</span> to
+    <span data-x="concept-image-density">image density</span>.</p>
+
+   </li>
+
+   </li>
+
    <li>
 
     <p>As soon as possible, jump to the first applicable entry from the following list:</p>