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

@yutakahirano commented on this pull request.



> @@ -1892,6 +1892,25 @@ 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

This disallows credentials to same-origin requests with mode: no-cors. Is it OK?

> @@ -1892,6 +1892,25 @@ 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:
+
+<ol>
+ <li><p>If <var>request</var>'s <a for=request>mode</a> is not <code>no-cors</code>", return
+ true.</p>
+
+ <li><p>If <var>request</var>'s <a for=request>client</a> is null, return true.</p>
+
+ <li><p>If <var>request</var>'s <a for=request>client</a>'s <a for="environment settings
+ object">embedder policy</a> is not
+ "<code><a for="embedder policy value">credentialless</a></code>", return true.</p>
+
+ <li><p>If <var>request</var>'s <a for=request>origin</a> is not <a>same origin</a> with

Can you tell me why this is needed? (It might be good to leave a note).

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