/Html/Como fazer placeholder que vira label

Como fazer placeholder que vira label

<div class="label-float">
  <input type="text" placeholder=" " />
  <label>Telefone</label>
</div>
<br/>
<div class="label-float">
  <input type="text" placeholder=" " required/>
  <label>Nome de Usuário</label>
</div>

Source: pt.stackoverflow.com

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