Re: [manifest] define URL Scope (closes #114) (#291)

> +        component of <var>B</var> (see URL spec <a href=
> +        "https://github.com/webspecs/url/issues/20">issue 20</a> regarding
> +        "subsumes").
> +        </li>
> +      </ul>
> +      <div class="issue" title="🐒 Monkey patch">
> +        <p>
> +          Enforcing the navigation scope depends on [[!HTML]]'s navigate
> +          algorithm. As such, the following algorithm monkey patches [[!HTML]].
> +          <a href="https://www.w3.org/Bugs/Public/show_bug.cgi?id=27653">Bug
> +          27653</a> has been filed to address this.
> +        </p>
> +      </div>
> +      <p>
> +        The user agent MUST navigate the application context as per [[!HTML]]'s
> +        navigate algorithm with exceptions enabled. If the URL being navigated

"Exceptions enabled" is defined in HTML (have another commit that does all the cross references). I means that trying to, say, set `window.location.href`, will throw. So will other APIs that can cause the page to navigate out of scope. 

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