简单粗暴上代码：
<!DOCTYPE <html>
<head>
<title></title>
<style type="text/css">
.input{
width:200px;
height:30px;
border:1px solid grey;
}
.input:empty::before{
color:lightgrey;
content:attr(placeholder);
}
</style>
</head>
<body>
<div class="input" contenteditable placeholder="请输入文字"></div>
</body>
</html>
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