div模拟textarea以实现高度自适应实例页面

代码

CSS代码:
.test_box {
    width: 400px; 
    min-height: 120px; 
    max-height: 300px;
    _height: 120px; 
    margin-left: auto; 
    margin-right: auto; 
    padding: 3px; 
    outline: 0; 
    border: 1px solid #a0b3d6; 
    font-size: 12px; 
    word-wrap: break-word;
    overflow-x: hidden;
    overflow-y: auto;
}
HTML代码:
<div class="test_box" contenteditable="true"><br /></div>

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