https://wisdmlabs.com/blog/create-adaptive-placeholders-using-css/

https://circleci.com/blog/adaptive-placeholders/

https://stackoverflow.com/questions/47983822/css-operator-adaptive-placeholder-contact-form-7-wordpress

<!DOCTYPE html>

<html lang="zh-cn">

<head>

    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />

    <title>Adaptive Placeholder – 自适应的占位符效果</title> 

    <style type="text/css">

    body {

    background-color: #FAFAFA;

}

.top-banner {

  background: #555;

}

input[type=text] {

  -webkit-box-sizing: border-box;

  -moz-box-sizing: border-box;

  box-sizing: border-box;

  width: 100%;

  height: -webkit-calc(3em + 2px);

  height: calc(3em + 2px);

  margin: 0 0 1em;

  padding: 1em;

  border: 1px solid #cccccc;

  border-radius: 1.5em;

  background: #fff;

  resize: none;

  outline: none;

}

input[type=text][required]:focus {

  border-color: #00bafa;

}

input[type=text][required]:focus + label[placeholder]:before {

  color: #00bafa;

}

input[type=text][required]:focus + label[placeholder]:before, input[type=text][required]:valid + label[placeholder]:before {

  -webkit-transition-duration: .2s;

  transition-duration: .2s;

  -webkit-transform: translate(0, -1.5em) scale(0.9, 0.9);

  -ms-transform: translate(0, -1.5em) scale(0.9, 0.9);

  transform: translate(0, -1.5em) scale(0.9, 0.9);

}

input[type=text][required]:invalid + label[placeholder][alt]:before {

  content: attr(alt);

}

input[type=text][required] + label[placeholder] {

  display: block;

  pointer-events: none;

  line-height: 2.3em;

  margin-top: -webkit-calc(-3em - 2px);

  margin-top: calc(-3em - 2px);

  margin-bottom: -webkit-calc((3em - 1em) + 2px);

  margin-bottom: calc((3em - 1em) + 2px);

}

input[type=text][required] + label[placeholder]:before {

  content: attr(placeholder);

  display: inline-block;

  margin: 0 -webkit-calc(1em + 2px);

  margin: 0 calc(1em + 2px);

  padding: 0 2px;

  color: #898989;

  white-space: nowrap;

  -webkit-transition: 0.3s ease-in-out;

  transition: 0.3s ease-in-out;

  background-image: -webkit-gradient(linear, left top, left bottom, from(#ffffff), to(#ffffff));

  background-image: -webkit-linear-gradient(top, #ffffff, #ffffff);

  background-image: linear-gradient(to bottom, #ffffff, #ffffff);

  -webkit-background-size: 100% 5px;

  background-size: 100% 5px;

  background-repeat: no-repeat;

  background-position: center;

}

    *, *:after, *:before { -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; }

.clearfix:after{visibility:hidden;display:block;font-size:0;content:" ";clear:both;height:0}

.clearfix{*zoom:1}

.fl{float:left}

.fr{float:right}

.fl,.fr{_display:inline}

.top-banner {

	position:absolute;

	z-index: 999;

	left:0;

	top:0;

	height:40px;

	line-height:40px;

	padding:0 30px;

	width:100%;

	font-size: 13px;

	background-color: rgba(255, 255, 255, 0.15);

	color: #fff;

	font-family: "宋体","Microsoft Yahei","Helvetica Neue",Helvetica,Arial,sans-serif;

	font-size: 15px;

	/*text-shadow: 1px 1px 3px #333;*/

	/*box-shadow: 0 1px 0 #999;*/

}

.top-banner a {

	color: #fff;

	text-decoration: none;

}

    </style>

   <script type="text/javascript">

$(function() {

    $("input[id$=address]").qtip({

        content: '涂聚文告诉你，好样的'

    });

});

</script>

</head>

<body>

    <div style="width:400px;height:100px;margin:300px auto">

        <form>

            <input required='必须填写' type='text' class="name" id="name">

            <label alt='请输入姓名' placeholder='姓名'></label>

            <input required='必须填写' type='text' class="address" id="address">

            <label alt='请输入地址' placeholder='地址'></label>

        </form>

    </div>

<div class="footer-banner" style="width:728px; margin:200px auto 0"></div>

<script src="js/jquery.min.js"></script>

</body>

</html>

　　

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