<!DOCTYPE html>
<style>
.green {
  display:inline-block;
  background: green;
  width: 50%;
}
.yellow {
  background: yellow;
  width: 50%;
}
</style>
<p>Test passes if yellow block is alongside green block, not in next line.</p>
<div>
  <div class='green'>
    <h1>Inline block<h1>
  </div>
  <div class='yellow'>
    <h1>Floating block</h1>
  </div>
</div>
<script>
window.onload = function() {
  document.body.offsetTop;
  document.querySelector('.yellow').style.float = 'right';
}
</script>