ment.getElementById(&quot;third-scrolling-container&quot;).scrollLeft = 300;">

  <p>Test passes if there are 3 filled green squares and <strong>no red</strong>.

  <div id="first-scrolling-container" class="scrolling-container">

    <div class="horizontal-spacer-200"></div><div id="first-sticky" class="sticky"></div><div class="horizontal-spacer-200"></div>

  </div>


  <div id="second-scrolling-container" class="scrolling-container">

    <div class="horizontal-spacer-200"></div><div id="second-sticky" 