section>
        <section id="destructuring">
          <%= htmlFor('destructuring') %>
        </section>
        <section id="fat-arrow">
          <%= htmlFor('fat_arrow') %>
        </section>
        <section id="generators">
          <%= htmlFor('generators') %>
        </section>
        <section id="async-functions">
          <%= htmlFor('async_functions') %>
        </section>
        <section id="classes">
          <%= htmlFor('classes') %>
        </section>
        <section id="prototypal-inh