Re: [fetch] Clarify the hooks into RFC6265 (#221)

> @@ -2847,11 +2857,13 @@ <h4 id="should-response-to-request-be-blocked-due-to-nosniff?"><dfn title="shoul
>   <!-- XXX xref HTTP cache -->
>  
>   <li>
> -  <p>If <var>credentials flag</var> is set and <var>response</var>'s
> -  <span title=concept-response-header-list>header list</span> contains one or more
> -  <span title=concept-header>headers</span> <span title=concept-header-name>named</span>
> -  `<code title>Set-Cookie</code>`, update the cookies. <span data-anolis-ref>COOKIES</span>
> -  <!-- XXX proper hook? -->
> +  <p>If <var>credentials flag</var> is set, and the user agent is not configured to block cookies for
> +  <var>httpRequest</var> (see <a href="https://tools.ietf.org/html/rfc6265#section-7">Section 7</a> of
> +  <span data-anolis-ref>COOKIES</span>), then execute the "set-cookie-string" algorithm defined in
> +  <a href="https://tools.ietf.org/html/rfc6265#section-5.2">Section 5.2</a> of
> +  <span data-anolis-ref>COOKIES</span> on the <span title=concept-header-value>value</span>
> +  of each <var>header</var> <span title=concept-header-name>named</span> `<code title>Set-Cookie</code>`
> +  contained in <var>response</var>'s <span title=concept-response-header-list>header list</span>.

Perhaps it's better to list there being `Set-Cookie` headers as the requirement and then have "then for each such header, run x on its value" or something like that. Now it's not super clear what happens if there are no such headers.

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https://github.com/whatwg/fetch/pull/221/files#r53613705