HTML <input> placeholder 属性

1、用法

placeholder 属性用于给 <input>标签输入字段为空时，提供提示信息hint

2、举例

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>input 标签 placeholder属性</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
    <script src="main.js"></script>
</head>
<body>
    <form>
        <input type="text" name="username" placeholder="input your name:"/>
        <input type="button" value="提交" />
    </form>
</body>
</html>

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