Re: [whatwg/fetch] Partition Blob URL fetches by Storage Key (PR #1783)

@recvfrom commented on this pull request.



>  
       <p class=note>The `<code>GET</code>` <a for=/>method</a> restriction serves no useful purpose
       other than being interoperable.
 
-     <li><p>Let <var>blob</var> be <var>blobURLEntry</var>'s <a for="blob URL entry">object</a>.
+     <li><p>Let <var>requestEnvironment</var> be the result of
+     <a for=request>determining the environment</a> given <var>request</var>.
+
+     <li><p>Let <var>isNavigation</var> be true if <var>request</var>'s <a for=request>mode</a> is
+     not "<code>navigate</code>"; otherwise, false.

Thanks for calling this out, I had overlooked that we didn't want to exempt all navigations from the partitioning checks and instead only want to exempt top-level navigations. I confirmed that Safari and Firefox both enforce partitioning checks on subframe navigations, so we'll implement it this way in Chromium as well, write a new WPT for this, and I'll update the spec here to look for destination equaling documenting as you suggested.

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