1<div id="tree"><ul></ul></div> 2<pre id="code"></pre> 3<div id="info" hidden> 4 <header> 5 <span id="i_symbol"></span> 6 <span id="i_kind"></span> 7 </header> 8 <section> 9 <div id="i_rules"></div> 10 <div id="i_alternatives"></div> 11 </section> 12 <section> 13 <div id="i_ancestors"></div> 14 </section> 15</div> 16