간결한 textarea 자동 조절

<div style="width: 470px;">

 <textarea style="width: 100%; height: 100px; resize: none; overflow-y: auto; padding: 1.1em; 

 padding-bottom: 0.2em; line-height: 1.6;" onkeyup="this.style.height='1px'; 

 this.style.height = (10+this.scrollHeight)+'px';">들어갈 내용</textarea>

</div>