CSS3 Backgrounds
CSS3 contains several new background properties,
which allow greater control of the background element.
In this chapter you will learn about the following background properties:
background-size
background-origin
You will also learn how to use multiple background images.
Browser Support
The numbers in the table specify the first browser version that fully supports the property.
Numbers followed by -webkit-, -moz-, or -o- specify the first version that worked with a prefix.
Property
IDE
Chrome
firebox
Safari
Opera
background-size
9.0
4.0
1.0 -webkit-
4.0
3.6 -moz-
4.1
3.0 -webkit-
10.5
10.0 -o-
background-origin
9.0
1.0
4.0
3.0
10.5
CSS3 The background-size Property
The background-size property specifies the size of the background image.
Before CSS3, the background image size was determined by the actual size of the image. In CSS3 it is possible to specify the size of the background image, which allows us to re-use background images in different contexts.
You can specify the size in pixels or in percentages. If you specify the size as a percentage, the size is relative to the width and height of the parent element.
Example 1
Resize a background image:
div {
background: url(img_flwr.gif);
background-size: 80px 60px;
background-repeat: no-repeat;
}
Example 2
Stretch the background image to completely fill the content area:
div {
background: url(img_flwr.gif);
background-size: 100% 100%;
background-repeat: no-repeat;
}
CSS3 The background-origin Property
The background-origin property specifies the positioning area of the background images.
The background image can be placed within the content-box, padding-box, or border-box area.
Example
Position the background image within the content-box:
div {
background: url(img_flwr.gif);
background-repeat: no-repeat;
background-size: 100% 100%;
background-origin: content-box;
}
CSS3 Multiple Background Images
CSS3 allows you to use several background images for an element.
Example
Set two background images for the <body> element:
body {
background: url(img_tree.gif),url(img_flwr.gif);
background-size: 100% 100%;
background-repeat: no-repeat;
}
CSS3 Background Properties
Property
Description
CSS
background-clip
Specifies the painting area of the background images
3
background-origin
Specifies the positioning area of the background images
3
background-size
Specifies the size of the background images
3
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