i>zero or more
            <a href="terminology.html#space" id="space_xref26">space characters</a>
</li>
            <li>a single
            "<code title="U+0022 QUOTATION MARK">"</code>"
            character</li>
            <li>an
            <a href="syntax.html#syntax-attribute-value" id="syntax-attribute-value_xref4">attribute value</a>
</li>
            <li>a
            "<code title="double U+0022 QUOTATION MARK">"</code>"
            character</li>
          </ol>
<p>In addition to the general req