HTML5和CSS3登录页面制作实录

本文详细介绍使用HTML5 和CSS3 制作一个登录页面的完整过程。

View demo

login.html

<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

View demo

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：