CSS3 background-size:contain

浏览器参照基准：Firefox3.6 and Later, Chrome5 and Later, Safari5 and Later, Opera11.50 and Later, IE9.0 and Later

所用图片：

示例：

#background-size-contain{
	background-size:contain;
}

* background-size的contain特定值会保持图像本身的宽高比例，将图片缩放到宽度或高度正好适应定义背景的区域。