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

@mingyc commented on this pull request.



> + <li><p><a for=list>For each</a> (<var>name</var>, <var>value</var>) of <var>request</var>'s
+ <a for=request>header list</a>, increment <var>totalRequestLength</var> by <var>name</var>'s
+ <a for="byte sequence">length</a> + <var>value</var>'s <a for="byte sequence">length</a>.
+
+ <li><p>Increment <var>totalRequestLength</var> by <var>request</var>'s <a for=request>body</a>'s
+ <a for=body>length</a>.
+
+ <li><p>Return <var>totalRequestLength</var>.
+</ol>
+</div>
+
+<div algorithm>
+<p>To <dfn>process deferred fetches</dfn> given a <a>fetch group</a> <var>fetchGroup</var>:
+
+<ol>
+ <li><p><a for=list>For each</a> <a for="fetch group">deferred fetch record</a>

> For each deferred fetch record deferredRecord of controlDocument’s fetch group’s deferred fetch records:

Consider the following example:


```
root (a.com) -> frame-1 (a.com) -> frame-2 (b.com)
             -> frame-3 (b.com) -> frame-4 (a.com)
```

Since `frame-1`'s `controlDocument` is `root`, any new fetchLater requests made in `frame-1`, when being processed by `To get the available deferred-fetch quota`, will only consider the existing deferred records from `root`? Is that expected?

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