用html5和css3写出登录页面教程

login.html代码如下：

<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>

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

#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);  
}
Stitch effect (缝效果)
#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;  
}

Subtle gradient lines (微妙的渐变线)

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;  
}

最终结果

以上就是用html5和css3写出的登录页面，怎么样大家学会了吗？

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