Re: [whatwg/fetch] Add a speculative flag to `Request` as well as related processing (#881)

annevk commented on this pull request.



> @@ -4072,6 +4076,12 @@ Range Requests</cite>. [[HTTP-RANGE]] However, this is not widely supported by b
 
     <p>is true, and unset otherwise.
 
+   <li><p>If <var>httpRequest</var>'s <a for=request>speculative flag</a> is set, 
+   <a for="header list">append</a>
+   `<code>Sec-Purpose</code>`/`<code>Prefetch</code>` to

Would be good to test the casing. 😊

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