Re: [whatwg/fetch] Specify the behavior of `COEP: credentialless`, (#1229)

@domenic commented on this pull request.



> @@ -1892,6 +1892,27 @@ source of security bugs. Please seek security review for features that deal with
  <a for="URL serializer"><i>exclude fragment</i></a> set to true.
 </ol>
 
+<p>To check <dfn export>Cross-Origin-Embedder-Policy allows credentials</dfn>, given a
+<a for=/>request</a> <var>request</var>, run theses steps:

```suggestion
<a for=/>request</a> <var>request</var>, run these steps:
```

> @@ -3507,9 +3532,24 @@ Cross-Origin-Resource-Policy     = %s"same-origin" / %s"same-site" / %s"cross-or
  <li><p>If <var>policy</var> is neither `<code>same-origin</code>`, `<code>same-site</code>`, nor
  `<code>cross-origin</code>`, then set <var>policy</var> to null.
 
- <li><p>If <var>policy</var> is null and <var>embedderPolicyValue</var> is
- "<code><a for="embedder policy value">require-corp</a></code>", then set <var>policy</var> to
- `<code>same-origin</code>`.
+ <li>
+  <p>If <var>policy</var> is null, switch on <var>embedderPolicyValue</var>:</p>
+  <dl class=switch>
+   <dt>`<a for="embedder policy value">unsafe-none</a>`

", not backtick, for the `<dt>`s since these are strings, not byte sequences

> @@ -4668,6 +4708,9 @@ steps. They return a <a for=/>response</a>.
 
     <p>is true; otherwise false.
 
+   <li><p>If <a>Cross-Origin-Embedder-Policy allows credentials</a> with <var>request</var> returns
+   false, then set <var>includeCredentials</var> to false.</p>

```suggestion
   false, then set <var>includeCredentials</var> to false.
```

> @@ -7843,6 +7889,7 @@ Arkadiusz Michalski,
 Arne Johannessen,
 Artem Skoretskiy,
 Arthur Barstow,
+Arthur Sonzogni, <!-- ArthurSonzogni; GitHub -->,

```suggestion
Arthur Sonzogni, <!-- ArthurSonzogni; GitHub -->
```

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