CSS background-origin

The CSS background-origin property was introduced in CSS3 for the purposes of setting the background positioning area of an element.

The background-origin property allows you to specify whether the background will be positioned relative to the "content box", "border box", or the "padding box".

The background-origin property can be used in conjunction with the background-clip and background-image properties to modify the position of a background image to match the clipping effect (supplied by the background-clip property).

In CSS3, the background-origin property has been added to the background shorthand property. This means that you can set the background-origin from within the background property (for example, background: url("background.png") 40% / 10em lightblue round fixed border-box;).

Syntax

background-origin: value

The formal syntax for this property is:

background-origin: <box> [ , <box> ]*

Where

<box> = border-box | padding-box | border-box

Below is an explanation of these values.

Possible Values

border-box
Specifies that the background position is relative to the border box.
padding-box
Specifies that the background position is relative to the padding box.
content-box
Specifies that the background position is relative to the content box.

In addition, all CSS properties also accept the following CSS-wide keyword values as the sole component of their property value:

initial
Represents the value specified as the property's initial value.
inherit
Represents the computed value of the property on the element's parent.
unset
This value acts as either inherit or initial, depending on whether the property is inherited or not. In other words, it sets all properties to their parent value if they are inheritable or to their initial value if not inheritable.

Basic Property Information

Initial Value
padding-box
Applies To
All elements
Inherited?
No
Media
Visual
Animatable
No

Example Code

Basic CSS

background-origin: border-box;

Working Example within an HTML Document

<!DOCTYPE html>
<title>Example</title>
<style>
.clipped {
  width: 220px;
  height: 150px;
  padding: 10px;
  background-color: yellowgreen;
  background-image: url(/pix/byron_bay_300x225.jpg);
  border: 20px solid rgba(0,0,0,0.3);
  background-clip: border-box;
  background-origin: border-box;
}
</style>
<div class="clipped">
  Testing the <code>background-origin</code> property!
</div>
<p>Change the value to see the difference between <code>content-box</code>, <code>padding-box</code>, and <code>border-box</code>.</p>

Try it with the Online Editor

CSS Specifications

Browser Support

The following table provided by Caniuse.com shows the level of browser support for this feature.

Vendor Prefixes

For maximum browser compatibility many web developers add browser-specific properties by using extensions such as -webkit- for Safari, Google Chrome, and Opera (newer versions), -ms- for Internet Explorer, -moz- for Firefox, -o- for older versions of Opera etc. As with any CSS property, if a browser doesn't support a proprietary extension, it will simply ignore it.

This practice is not recommended by the W3C, however in many cases, the only way you can test a property is to include the CSS extension that is compatible with your browser.

The major browser manufacturers generally strive to adhere to the W3C specifications, and when they support a non-prefixed property, they typically remove the prefixed version. Also, W3C advises vendors to remove their prefixes for properties that reach Candidate Recommendation status.

Many developers use Autoprefixer, which is a postprocessor for CSS. Autoprefixer automatically adds vendor prefixes to your CSS so that you don't need to. It also removes old, unnecessary prefixes from your CSS.

You can also use Autoprefixer with preprocessors such as Less and Sass.