<style>
.container{
  width: 60px;
  overflow: hidden;
}

.floater {
  float: right;
  width: 50px;
  height:50px;
  background-color: blue;
}

span {
  white-space: nowrap;
}
</style>
<div class=container><div class=floater></div></div>
<div><span>PASS if not overlapping the blue floating box.</span></div>