CSS3 用户界面
1、CSS3 调整尺寸(Resizing)
CSS3中，resize属性指定一个元素是否应该由用户去调整大小。这个 div 元素由用户调整大小。 (在 Firefox 4+, Chrome, 和 Safari中)
<!DOCTYPE html>
<html>
<head>
<style>
div
{
border:2px solid;
padding:10px 40px;
width:300px;
resize:both;
overflow:auto;
}
</style>
</head>
<body>
<p><b>Note:</b> Firefox, Safari, and Chrome support the resize property.</p>
<div>The resize property specifies whether or not an element is resizable by the user.</div>
</body>
</html>
2、CSS3 方框大小调整(Box Sizing)
box-sizing 属性允许您以确切的方式定义适应某个区域的具体内容。
<!DOCTYPE html>
<html>
<head>
<style>
div.container
{
width:30em;
border:1em solid;
}
div.box
{
box-sizing:border-box;
-moz-box-sizing:border-box; /* Firefox */
width:50%;
border:1em solid red;
float:left;
}
</style>
</head>
<body>
<div class="container">
<div class="box">This div occupies the left half.</div>
<div class="box">This div occupies the right half.</div>
</div>
</body>
</html>
3、CSS3 外形修饰（outline-offset ）
outline-offset 属性对轮廓进行偏移，并在超出边框边缘的位置绘制轮廓。
轮廓与边框有两点不同：轮廓不占用空间、轮廓可能是非矩形。规定边框边缘之外 15 像素处的轮廓：
<!DOCTYPE html>
<html>
<head>
<style>
div
{
margin:20px;
width:150px;
padding:10px;
height:70px;
border:2px solid black;
outline:2px solid red;
outline-offset:15px;
}
</style>
</head>
<body>
<p><b>Note:</b> Internet Explorer does not support the outline-offset property.</p>
<div>This div has an outline border 15px outside the border edge.</div>
</body>
</html>
