textarea自适应高度

<!--textarea自适应高度--> <h3>textarea自适应高度</h3> <textarea style='border: 1px solid #94BBE2;width:100%;' rows=15 onpropertychange='this.style.posHeight=this.scrollHeight' id=textarea onfocus='textarea.style.posHeight=this.scrollHeight'> <br> <Br> </textarea>

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