Re: [whatwg/fetch] HTTP cache partitioning (#943)

@annevk commented on this pull request.



>     <a for="environment">top-level origin</a>.
 
+   <li>
+    <p>If <var>topLevelOrigin</var> is null, then set <var>topLevelOrigin</var> to
+    <var>request</var>'s <a for=request>reserved client</a>'s
+    <a for="environment">top-level creation URL</a>'s <a for=url>origin</a>.
+
+    <p class=note>This happens for top-level navigations only.
+
    <li><p>Assert: <var>topLevelOrigin</var> is an <a for=/>origin</a>.

How can it be null?

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