clang-tools-extra/pseudo/tool/HTMLForest.html

<div id="tree"><ul></ul></div>
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<div id="info" hidden>
  <header>
    <span id="i_symbol"></span>
    <span id="i_kind"></span>
  </header>
  <section>
    <div id="i_rules"></div>
    <div id="i_alternatives"></div>
  </section>
  <section>
    <div id="i_ancestors"></div>
  </section>
</div>