zurb-foundation-5/doc/includes/grid/examples_grid_nested_rendered.html

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

<div class="row display">
  <div class="small-8 columns">8
    <div class="row">
      <div class="small-8 columns">8 Nested
        <div class="row">
          <div class="small-8 columns">8 Nested Again</div>
          <div class="small-4 columns">4</div>
        </div>
      </div>
      <div class="small-4 columns">4</div>
    </div>
  </div>
  <div class="small-4 columns">4</div>
</div>