<!DOCTYPE html>
Passes if there are two green squares of the same size.
<style>
.square {
  position: absolute;
  width: 100px;
  height: 100px;
  background: green;
}
</style>
<div style="height: 100px"></div>
<div class="square" style="left: 0"></div>
<div class="square" style="left: 400px"></div>