html – 占位符自动换行输入字段

我需要在输入字段中放置一个长占位符文本.

但是,由于文本较长,占位符将被删除.

<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<label for="password">
  <input id="password" name="user[password]" placeholder="Password (at least 8 letters,numbers,or punctuation marks)" size="30" type="password">
</label>

有没有办法让它成为这个？

解决方法

input{
  height:50px;
}

::-webkit-input-placeholder { /* Chrome/Opera/Safari */
  white-space:pre-line;  
  position:relative;
  top:-7px;
  
}
::-moz-placeholder { /* Firefox 19+ */
     white-space:pre-line;  
  position:relative;
  top:-7px;
}
:-ms-input-placeholder { /* IE 10+ */
    white-space:pre-line;  
  position:relative;
  top:-7px;
}
:-moz-placeholder { /* Firefox 18- */
     white-space:pre-line;  
  position:relative;
  top:-7px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

<label for="password">
  <input id="password" name="user[password]" placeholder="Password (at least 8 letters,or punctuation marks)" size="30" type="password">
</label>

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