Use css to achieve adaptive title floating effect (code example)-CSS Tutorial-php.cn

Use css to achieve adaptive title floating effect (code example)

青灯夜游

Release： 2021-04-19 10:09:03

forward

1682 people have browsed it

This article uses code examples to introduce to you how to achieve adaptive title floating effects in CSS. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

(Learning video sharing: css video tutorial)

Effect display:

Use css to achieve adaptive title floating effect (code example)

Source code display:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>纯css实现自适应标题浮动效果</title>
 
    <style>
        body {
            background-color:#FAFAFA;
        }
 
        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;
}
</style>
</head>
<body>
<div style="width:400px;height:100px;margin:50px auto">
<form>
<input required="" type="text">
<label alt="请输入用户名" placeholder="名称"></label>
</form>
</div>
</body>
</html>

Copy after login

For more programming-related knowledge, please visit: Programming Video! !

The above is the detailed content of Use css to achieve adaptive title floating effect (code example). For more information, please follow other related articles on the PHP Chinese website!