Re: [whatwg/fetch] Deferred fetching (PR #1647)

@noamr commented on this pull request.



> +    <a>subframe reserved deferred-fetch quota</a>.
+
+    <p class=note>This is a cross-origin/cross-agent subframe, so it spends some of the quota of
+    this document and its relatives.
+  </ol>
+ <li><p>If <var>quota</var> is less than zero, than return zero.
+
+ <li><p>If <var>quota</var> is less than <var>quotaForOrigin</var>, then
+ return <var>quota</var>.
+
+ <li><p>Return <var>quotaForOrigin</var>.
+</ol>
+</div>
+
+<div algorithm>
+<p>To <dfn export>reserve deferred-fetch quota</dfn> for a <a>navigable container</a>

To summarize:
```
root (a.com) -> frame_a (a.com) -> frame_c (b.com)
                      -> frame_d (b.com) -> frame_b (a.com)
             
```

- `frame_a` will receive 64kb, but it would be ignored because it shares quota with root
- `frame_c` will receive 8kb because it passes all the conditions for minimal quota
- `frame_d` as well
- `frame_b` will receive 0, because it fails the outer condition in (2): (the parent has to share quota with the top levle)


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