本例实现了点击下拉弹出登录界面的效果，整个界面华丽美观，没有使用任何图片，效果全部依靠HTML5+CSS3制作，非常了得
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样式及脚本定义如下：
<style>
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
display: block;
}
fieldset
{
margin: 0;
padding: 0;
border: 0;
}
input:focus,textarea:focus {
outline: none;
}
/*----------------------*/
body
{
font-family: Arial, Helvetica, sans-serif;
color: #444;
background: #eee ;
margin: 0;
font-size: 12px;
}
/*----------------------*/
.cf:before,
.cf:after {
content:"";
display:table;
}
.cf:after {
clear:both;
}
.cf {
zoom:1;
}
/*----------------------*/
header {
padding: 8px 10%;
border-bottom: 1px solid #fff;
background-color: #777;
background-image: -webkit-gradient(linear, left top, left bottom, from(#777), to(#555));
background-image: -webkit-linear-gradient(top, #777, #555);
background-image: -moz-linear-gradient(top, #777, #555);
background-image: -ms-linear-gradient(top, #777, #555);
background-image: -o-linear-gradient(top, #777, #555);
background-image: linear-gradient(top, #777, #555);
-moz-box-shadow: 0 -3px 3px rgba(0,0,0,.5) inset;
-webkit-box-shadow: 0 -3px 3px rgba(0,0,0,.5) inset;
box-shadow: 0 -3px 3px rgba(0,0,0,.5) inset;
}
/*----------------------*/
nav ul {
margin: 0;
padding: 0;
list-style: none;
position: relative;
float: right;
background: #eee;
border-bottom: 1px solid #fff;
-moz-border-radius: 3px;
-webkit-border-radius: 3px;
border-radius: 3px;
}
nav li {
float: left;
}
nav #login {
border-right: 1px solid #ddd;
-moz-box-shadow: 1px 0 0 #fff;
-webkit-box-shadow: 1px 0 0 #fff;
box-shadow: 1px 0 0 #fff;
}
nav #login-trigger,
nav #signup a {
display: inline-block;
*display: inline;
*zoom: 1;
height: 25px;
line-height: 25px;
font-weight: bold;
padding: 0 8px;
text-decoration: none;
color: #444;
text-shadow: 0 1px 0 #fff;
}
nav #signup a {
-moz-border-radius: 0 3px 3px 0;
-webkit-border-radius: 0 3px 3px 0;
border-radius: 0 3px 3px 0;
}
nav #login-trigger {
-moz-border-radius: 3px 0 0 3px;
-webkit-border-radius: 3px 0 0 3px;
border-radius: 3px 0 0 3px;
}
nav #login-trigger:hover,
nav #login .active,
nav #signup a:hover {
background: #fff;
}
nav #login-content {
display: none;
position: absolute;
top: 24px;
right: 0;
z-index: 999;
background: #fff;
background-image: -webkit-gradient(linear, left top, left bottom, from(#fff), to(#eee));
background-image: -webkit-linear-gradient(top, #fff, #eee);
background-image: -moz-linear-gradient(top, #fff, #eee);
background-image: -ms-linear-gradient(top, #fff, #eee);
background-image: -o-linear-gradient(top, #fff, #eee);
background-image: linear-gradient(top, #fff, #eee);
padding: 15px;
-moz-box-shadow: 0 2px 2px -1px rgba(0,0,0,.9);
-webkit-box-shadow: 0 2px 2px -1px rgba(0,0,0,.9);
box-shadow: 0 2px 2px -1px rgba(0,0,0,.9);
-moz-border-radius: 3px 0 3px 3px;
-webkit-border-radius: 3px 0 3px 3px;
border-radius: 3px 0 3px 3px;
}
nav li #login-content {
right: 0;
width: 250px;
}
/*--------------------*/
#inputs input {
background: #f1f1f1;
padding: 6px 5px;
margin: 0 0 5px 0;
width: 238px;
border: 1px solid #ccc;
-moz-border-radius: 3px;
-webkit-border-radius: 3px;
border-radius: 3px;
-moz-box-shadow: 0 1px 1px #ccc inset;
-webkit-box-shadow: 0 1px 1px #ccc inset;
box-shadow: 0 1px 1px #ccc inset;
}
#inputs input:focus {
background-color: #fff;
border-color: #e8c291;
outline: none;
-moz-box-shadow: 0 0 0 1px #e8c291 inset;
-webkit-box-shadow: 0 0 0 1px #e8c291 inset;
box-shadow: 0 0 0 1px #e8c291 inset;
}
/*--------------------*/
#login #actions {
margin: 10px 0 0 0;
}
#login #submit {
background-color: #d14545;
background-image: -webkit-gradient(linear, left top, left bottom, from(#e97171), to(#d14545));
background-image: -webkit-linear-gradient(top, #e97171, #d14545);
background-image: -moz-linear-gradient(top, #e97171, #d14545);
background-image: -ms-linear-gradient(top, #e97171, #d14545);
background-image: -o-linear-gradient(top, #e97171, #d14545);
background-image: linear-gradient(top, #e97171, #d14545);
-moz-border-radius: 3px;
-webkit-border-radius: 3px;
border-radius: 3px;
text-shadow: 0 1px 0 rgba(0,0,0,.5);
-moz-box-shadow: 0 0 1px rgba(0, 0, 0, 0.3), 0 1px 0 rgba(255, 255, 255, 0.3) inset;
-webkit-box-shadow: 0 0 1px rgba(0, 0, 0, 0.3), 0 1px 0 rgba(255, 255, 255, 0.3) inset;
box-shadow: 0 0 1px rgba(0, 0, 0, 0.3), 0 1px 0 rgba(255, 255, 255, 0.3) inset;
border: 1px solid #7e1515;
float: left;
height: 30px;
padding: 0;
width: 100px;
cursor: pointer;
font: bold 14px Arial, Helvetica;
color: #fff;
}
#login #submit:hover,
#login #submit:focus {
background-color: #e97171;
background-image: -webkit-gradient(linear, left top, left bottom, from(#d14545), to(#e97171));
background-image: -webkit-linear-gradient(top, #d14545, #e97171);
background-image: -moz-linear-gradient(top, #d14545, #e97171);
background-image: -ms-linear-gradient(top, #d14545, #e97171);
background-image: -o-linear-gradient(top, #d14545, #e97171);
background-image: linear-gradient(top, #d14545, #e97171);
}
#login #submit:active {
outline: none;
-moz-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.5) inset;
-webkit-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.5) inset;
box-shadow: 0 1px 4px rgba(0, 0, 0, 0.5) inset;
}
#login #submit::-moz-focus-inner {
border: none;
}
#login label {
float: right;
line-height: 30px;
}
#login label input {
position: relative;
top: 2px;
right: 2px;
}
/*--------------------*/
#about {
margin: 15px;
}
#about a {
color: #555;
}
</style>
<!--[if lt IE 9]>
<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
$('#login-trigger').click(function(){
$(this).next('#login-content').slideToggle();
$(this).toggleClass('active');
if ($(this).hasClass('active')) $(this).find('span').html('▲')
else $(this).find('span').html('▼')
})
});
</script>
HTML代码定义如下：
<header class="cf"> <nav> <ul> <li id="login"> <a id="login-trigger" href="#"> Log in <span>▼</span> </a> <div id="login-content"> <form> <fieldset id="inputs"> <input id="username" type="email" name="Email" placeholder="Your email address" required> <input id="password" type="password" name="Password" placeholder="Password" required> </fieldset> <fieldset id="actions"> <input type="submit" id="submit" value="Log in"> <label><input type="checkbox" checked="checked"> Keep me signed in</label> </fieldset> </form> </div> </li> <li id="signup"> <a href="">Sign up FREE</a> </li> </ul> </nav> </header>
注：需要浏览器支持HTML5+CSS3
