核心属性contenteditable=true！
.text_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;
}
<div contenteditable
='true' class
='text_box'><br
/></div
>
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