<div>
  <div class="square float-left">floating left</div>
  <div class="square float-right">floating right</div>
</div>
.square {
  width: 150px;
  height: 150px;
  background: #000;
  color: white;
}
.float-left {
  float: left;
}
.float-right {
  float: right;
}

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