<p>placeholder πŸ‘‰ <input type="text" placeholder="ν…μŠ€νŠΈλ₯Ό μž…λ ₯ν•˜μ„Έμš”."></p>
<form>required πŸ‘‰ <input type="text" required> <input type="submit"></form>
<p>maxlangth πŸ‘‰ <input type="text" maxlength="5"></p>

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