本文详细介绍使用HTML5 和CSS3 制作一个登录页面的完整过程。
login.html
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<form id="login">
<h1>Log In</h1>
<fieldset id="inputs">
<input id="username" type="text" placeholder="Username" autofocus required>
<input id="password" type="password" placeholder="Password" required>
</fieldset>
<fieldset id="actions">
<input type="submit" id="submit" value="Log in">
<a href="">Forgot your password?</a><a href="">Register</a>
</fieldset>
</form>
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所用到的HTML 5的特性：
◆ placeholder – 输入框的简短提示，当该输入框获得输入焦点时，该提示信息自动消失
◆ required – 指定该输入元素是否必须提供
◆ autofocus – 指定输入框是否在页面加载完毕自动获取输入焦点
◆ type=”password” – 指定密码输入(非HTML5专有)
CSS
在这里我们用到了 CSS3 的一些专有属性，包括：
Box-shadow 可以帮我们制作效果很好的边框阴影
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#login
{
box-shadow:
0 0 2px rgba(0, 0, 0, 0.2),
0 1px 1px rgba(0, 0, 0, .2),
0 3px 0 #fff,
0 4px 0 rgba(0, 0, 0, .2),
0 6px 0 #fff,
0 7px 0 rgba(0, 0, 0, .2);
}
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Stitch effect (缝效果)
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#login
{
position: absolute;
z-index: 0;
}
#login:before
{
content: '';
position: absolute;
z-index: -1;
border: 1px dashed #ccc;
top: 5px;
bottom: 5px;
left: 5px;
right: 5px;
-moz-box-shadow: 0 0 0 1px #fff;
-webkit-box-shadow: 0 0 0 1px #fff;
box-shadow: 0 0 0 1px #fff;
}
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Subtle gradient lines (微妙的渐变线)
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h1
{
text-shadow: 0 1px 0 rgba(255, 255, 255, .7), 0px 2px 0 rgba(0, 0, 0, .5);
text-transform: uppercase;
text-align: center;
color: #666;
margin: 0 0 30px 0;
letter-spacing: 4px;
font: normal 26px/1 Verdana, Helvetica;
position: relative;
}
h1:after, h1:before
{
background-color: #777;
content: "";
height: 1px;
position: absolute;
top: 15px;
width: 120px;
}
h1:after
{
background-image: -webkit-gradient(linear, left top, right top, from(#777), to(#fff));
background-image: -webkit-linear-gradient(left, #777, #fff);
background-image: -moz-linear-gradient(left, #777, #fff);
background-image: -ms-linear-gradient(left, #777, #fff);
background-image: -o-linear-gradient(left, #777, #fff);
background-image: linear-gradient(left, #777, #fff);
right: 0;
}
h1:before
{
background-image: -webkit-gradient(linear, right top, left top, from(#777), to(#fff));
background-image: -webkit-linear-gradient(right, #777, #fff);
background-image: -moz-linear-gradient(right, #777, #fff);
background-image: -ms-linear-gradient(right, #777, #fff);
background-image: -o-linear-gradient(right, #777, #fff);
background-image: linear-gradient(right, #777, #fff);
left: 0;
}
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最终结果
结论
在一些老的浏览器上也表现不错，下图是在IE8下的效果：
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