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

@mingyc commented on this pull request.



> +
+ <li><p>Let <var>request</var> be <var>requestObject</var>'s <a for=Request>request</a>.
+
+ <li><p>If <var>request</var>'s <a for=request>URL</a>'s <a for=url>scheme</a> is not an
+ <a>HTTP(S) scheme</a> then throw a {{TypeError}}.
+
+ <li><p>If <var>request</var>'s <a for=request>URL</a> is not a
+ [=potentially trustworthy url=], then throw a {{SecurityError}}.
+
+ <li><p>Let <var>backgroundTimeout</var> be null.
+
+ <li><p>If <var>init</var> is given and <var>init</var>["<code>backgroundTimeout</code>"]
+ <a for=map>exists</a> then set <var>backgroundTimeout</var> to
+ <var>init</var>["<code>backgroundTimeout</code>"].
+
+ <li><p>If <var>backgroundTimeout</var> is not a {{DOMHighResTimeStamp}} then throw a {{TypeError}}.

```
If backgroundTimeout is not a [ DOMHighResTimeStamp ] then throw a [ TypeError ].
```

Should it also throws TypeError if backgroundTimeout is negative? DOMHighResTimeStamp according to its spec is a double, which can be negative, but a negative timeout makes no sense for a duration.

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