Markup: components/navigation/feature-nav.twig
<div class="main-nav__wrapper main-nav--feature__wrapper">
  <!-- Featured items and hamburger button -->
  <div class="main-nav--feature__inner-wrapper">
    <ul class="main-nav--feature__featured-items">
      <li class="menu-item">
        <a href="/" data-drupal-link-system-path="<front>">Home</a>
      </li>
      <li class="menu-item">
        <a href="/fundraise" data-drupal-link-system-path="node/22" class="is-active">Fundraise (Landing)</a>
      </li>
      <li class="menu-item">
        <a href="/whats-going-on" data-drupal-link-system-path="node/17">What's going on</a>
      </li>
    </ul>
    <!-- Mobile: navigation toggle button -->
    <div class="main-nav__icons main-nav__burger">
      <a role="button" class="c-hamburger c-hamburger--htx main-nav-toggle" href="#" aria-expanded="false">
        <div class="c-hamburger__text">
          <span class="visually-hidden">Open and close navigation menu</span>
        </div>
        <span></span>
      </a>
    </div>
  </div>
  <!-- Main navigation menu -->
  <nav role="navigation" class="navigation menu--main">
    <h2 class="visually-hidden" id="main-nav__title"> Main navigation menu </h2>
    <ul id="main-menu" class="main-nav--feature__items menu sm main-nav__items">
      <li class="menu-item">
        <a href="/">Home</a>
      </li>
      <li class="menu-item">
        <a href="/">Fundraise</a>
      </li>
      <li class="menu-item">
        <a href="/link">What's going on</a>
      </li>
      <li class="menu-item">
        <a href="/">FAQ</a>
      </li>
      <li class="menu-item">
        <a href="/">Legal</a>
      </li>
    </ul>
  </nav>
</div>
Source: base-styleguide.scss, line 458