Re: [w3c/manifest] Let user agents process a manifest for a document with no manifest link, and choose the display mode (PR #1255)

@benfrancis commented on this pull request.



> @@ -1878,6 +1878,18 @@ <h3>
             </p>
           </aside>
         </section>
+        <section>
+          <h3>
+            Processing a document without a manifest link
+          </h3>
+          <p>
+            A [=document=] can also have no manifest link. The user agent MAY
+            still [=processing a manifest|process a manifest=] for that
+            [=document=], passing its [=Document/URL=] as both |document
+            URL:URL| and |manifest URL:URL|, an empty [=byte sequence=] as

My understanding of section [4.6.8.11](https://html.spec.whatwg.org/multipage/links.html#link-type-manifest) of the HTML specification is that if a page does not contain a `<link rel=manifest>` element then nothing happens at all. User agents only use "the first link element in tree order whose rel attribute contains the token manifest".

With no such `link`, there is no `el`, no fetch, no `response`, and therefore no document URL, manifest URL, bodyBytes or client for manifest processing.

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