zurb-foundation-5/doc/includes/accordion/examples_accordion_intro.html

Foundation 5 for npm (no code modification from original repo)

<ul class="accordion" data-accordion>
  <li class="accordion-navigation">
    <a href="#panel1a">Accordion 1</a>
    <div id="panel1a" class="content active">
      <ul class="small-block-grid-2 large-block-grid-3 ">
        <li><img src="http://placehold.it/350x150"></li>
        <li><img src="http://placehold.it/350x150"></li>
        <li><img src="http://placehold.it/350x150"></li>
      </ul>
    </div>
  </li>
  <li class="accordion-navigation">
    <a href="#panel2a">Accordion 2</a>
    <div id="panel2a" class="content">
      <div class="row">
        <div class="small-6 columns">
          <p>Panel 2. Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
      </div>
      <div class="small-6 columns">
        <img src="http://placehold.it/350x150">
      </div>
    </div>
  </li>
  <li class="accordion-navigation">
    <a href="#panel3a">Accordion 3</a>
    <div id="panel3a" class="content">
      Panel 3. Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
    </div>
  </li>
</ul>