<li><p>If <var>charset</var> is null, then set <var>charset</var> to <a>UTF-8</a>.

<li><p>Let <var>document</var> be a

<a>document</a> that

<a for=/>document</a> that

represents the result parsing <var>xhr</var>'s <a>received bytes</a> following the rules set

forth in the HTML Standard for an HTML parser with scripting disabled and

<a>a known definite encoding</a> <var>charset</var>.

</ol>

<li>

<p>Otherwise, let <var>document</var> be a <a>document</a> that represents the result of running

the <a>XML parser</a> with <a>XML scripting support disabled</a> on <var>xhr</var>'s

<p>Otherwise, let <var>document</var> be a <a for=/>document</a> that represents the result of

running the <a>XML parser</a> with <a>XML scripting support disabled</a> on <var>xhr</var>'s

<a>received bytes</a>. If that fails (unsupported character encoding,

namespace well-formedness error, etc.), then return null. [[!HTML]]