 id="space_xref23">space characters</a>
</li>
            <li>a
            "<code title="U+003D EQUALS SIGN">=</code>"
            character</li>
            <li>zero or more
            <a href="terminology.html#space" id="space_xref24">space characters</a>
</li>
            <li>a single
            "<code title="U+0027 APOSTROPHE">'</code>"
            character</li>
            <li>an
            <a href="syntax.html#syntax-attribute-value" id="syntax-attribute-value_xref3">attribute value</a>
</li>
   