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CSS 背景 
The CSS background properties define the background effects of an element.
CSS的background属性可为元素定义背景效果。
实例
Set the background color
This example demonstrates how to set the background color for an element.
怎样为元素设置背景颜色
Set an image as the background
This example demonstrates how to set an image as the background
将图片设置为背景
How to repeat a background image
This example demonstrates how to repeat a background image.
如何重复背景图片
How to repeat a background image only vertically
This example demonstrates how to repeat a background image only vertically.
如何让背景图片垂直重复
How to repeat a background image only horizontally
This example demonstrates how to repeat a background image only horizontally.
如何让背景图片水平重复
How to place the background image
This example demonstrates how to place the image on the page.
如何将图片放在页面上
How to set a fixed background image
This example demonstrates how to set a fixed background image. The image will not scroll with the rest of the page.
怎样让背景图片固定在背景上，不跟随页面一起移动
All the background properties in one declaration
This example demonstrates how to use the shorthand property for setting all of the background properties in one declaration.
怎样使用一句声明就能设置所有与background属性有关的值
CSS Background Properties
CSS 背景属性
The CSS background properties allow you to control the background color of an element, set an image as the background, repeat a background image vertically or horizontally, and position an image on a page.
CSS背景属性允许你控制元素的背景颜色，设置一图片做为背景，垂直或水平的重复背景图片，和图片在页面上的位置。
Browser support: IE: Internet Explorer, F: Firefox, N: Netscape.
浏览器支持： IE: Internet Explorer, F: Firefox, N: Netscape.
W3C: The number in the "W3C" column indicates in which CSS recommendation the property is defined (CSS1 or CSS2).
在W3C中的数字代表CSS的版本（CSS1或CSS2）
| Property属性 | Description描述 | Values值 | IE | F | N | W3C |
|---|---|---|---|---|---|---|
| background | A shorthand property for setting all background properties in one declaration 一个速记属性来用一个声明设置所有背景属性 |
background-color background-image background-repeat background-attachment background-position |
4 | 1 | 6 | 1 |
| background-attachment | Sets whether a background image is fixed or scrolls with the rest of the page 设置背景图片为固定还是滚屏的 |
scroll fixed |
4 | 1 | 6 | 1 |
| background-color | Sets the background color of an element 为一元素设置背景颜色 |
color-rgb color-hex color-name transparent |
4 | 1 | 4 | 1 |
| background-image | Sets an image as the background 设置一图片做为背景 |
url none |
4 | 1 | 4 | 1 |
| background-position | Sets the starting position of a background image 设置背景图片的起始位置 |
top left top center top right center left center center center right bottom left bottom center bottom right x-% y-% x-pos y-pos |
4 | 1 | 6 | 1 |
| background-repeat | Sets if/how a background image will be repeated 如果背景有重复图片的话就用这个设置 |
repeat repeat-x repeat-y no-repeat |
4 | 1 | 4 | 1 |
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