<style>
body {
  margin: 0px;
}
.container {
  color: transparent;
  line-height: 50px;
}

.abs_pos {
  position: absolute;
  width: 40px;
  height: 40px;
  background-color: green;
}
</style>
<div class=container>
  <div class=abs_pos></div>
  PASS if two green boxes show.
  <div class=abs_pos></div>
</div>