Re: [fetch] Integrating support for PasswordCredential objects. (#237)

>   <span title=concept-request-method>method</span> is `<code title>GET</code>` or
> - `<code title>HEAD</code>`, <span data-anolis-spec=webidl>throw</span> a
> - <code title>TypeError</code>.
> + `<code title>HEAD</code>`, or <var>request</var>'s
> + <span title=concept-request-attached-credential>attached credential</span> is non-null.

Maybe 
```
<p>If all of the following are true
<ul class=brief>
 <li><p>init's body member is present and is non-nonull or inputBody is non-null
 <li><p>request's method is GET or HEAD, or request's attached credential is non-null
</ul>
<p>then throw a ... exception.</p>
```
Basically use `<ul class=brief>` as something that is part of the paragraph even though it's not. Started using that here and there and I think it makes these kind of statements easier to read.

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