CodePen Embed - focus

<!-- 폼 안에서 포커스가 된 경우 클래스를 추가함 -->
<form onfocus="this.className='focused'">
  <input type="text" name="surname" value="성">
  <input type="text" name="name" value="이름">
</form>

<style> .focused { outline: 1px solid red; } </style>

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