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

@mingyc commented on this pull request.



> +
+
+<div algorithm>
+<p>To get the <dfn>available deferred-fetch quota</dfn> given a {{Document}}
+<var>document</var> and an <a for=/>origin</a>-or-null <var>origin</var>:
+
+<ol>
+ <li><p>Let <var>quota</var> be zero.
+
+ <li><p>Let <var>quotaForOrigin</var> be 64 kibibytes.
+
+ <li>
+  <p>For each <var>otherNavigable</var> in <var>document</var>'s <a>node navigable</a>'s
+  <a for=navigable>top-level traversable</a>'s <a>inclusive descendant navigables</a>:
+
+  <p class=note>This algorithm iterates over the entire navigable tree. It accumulates quota from

```
This algorithm iterates over the entire navigable tree.
```

Given the following example

```
root (a.com) -> frame_1 (a.com)
             -> frame_2 (a.com)
             -> frame_3 (b.com)
             -> frame_4 (b.com)
```

Let document be `frame_3` on its navigation, running the algorithm gives the following

* `quotaForOrigin` = 64 kb
* `quota` = 8*2 kb, as the following step is run twice, on `frame_3` and `frame_4`:
  
   ```
   Otherwise, if otherContainer’s subframe reserved deferred-fetch quota is minimal 
   subframe deferred-fetch quota and otherDocument is allowed to use the policy- 
    controlled feature "deferred-fetch-minimal", then increment quota by minimal 
   subframe deferred-fetch quota.
   ```
* return 64 kb (quotaForOrigin)

But the quota for `frame_3` (or `frame_4`) should just be `8kb` by default?

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