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<!DOCTYPE html>
<style>
.box {
  width: 50px;
  height: 50px;
  background-color: green;
}
</style>
<div class=box></div>
<!DOCTYPE html>
<style>
.box {
  width: 50px;
  height: 50px;
  background-color: green;
}
</style>
<div class=box></div>