The <image> CSS data type represents a two-dimensional image. There are two kinds of images: plain images, referenced with a <url>, and dynamically-generated images, generated with <gradient> or element(). Images can be used with numerous CSS properties, such as background-image, border-image, content, cursor, and list-style-image.

Image types

CSS can handle the following kinds of images:

  • Images with intrinsic dimensions (a natural size), like a JPEG, PNG, or other raster format.
  • Images with multiple intrinsic dimensions, existing in multiple versions inside a single file, like some .ico formats. (In this case, the intrinsic dimensions will be those of the image largest in area and the aspect ratio most similar to the containing box.)
  • Images with no intrinsic dimensions but with an intrinsic aspect ratio between its width and height, like an SVG or other vector format.
  • Images with neither intrinsic dimensions, nor an intrinsic aspect ratio, like a CSS gradient.

CSS determines an object's concrete size using (1) its intrinsic dimensions; (2) its specified size, defined by CSS properties like width, height, or background-size; and (3) its default size, determined by the kind of property the image is used with:

Kind of object Default object size
background-image The size of the element's background positioning area
list-style-image The size of a 1em character
border-image The size of the element's border image area
cursor The browser-defined size matching the usual cursor size on the client's system
border-image-source ?
mask-image ?
shape-outside ?
mask-border-source ?
Replaced content, as when combining content with a pseudo-element (::after or ::before) A 300px × 150px rectangle

The concrete object size is calculated using the following algorithm:

  • If the specified size defines both the width and the height, these values are used as the concrete object size.
  • If the specified size defines only the width or only the height, the missing value is determined using the intrinsic ratio, if there is any, the intrinsic dimensions if the specified value matches, or the default object size for that missing value.
  • If the specified size defines neither the width nor the height, the concrete object size is calculated so that it matches the intrinsic aspect ratio of the image but without exceeding the default object size in any dimension. If the image has no intrinsic aspect ratio, the intrinsic aspect ratio of the object it applies to is used; if this object has none, the missing width or height are taken from the default object size.
Note: Not all browsers support every type of image on every property. See the browser compatibility section for details.

Syntax

The <image> data type can be represented with any of the following:

  • An image denoted by the <url> data type
  • A <gradient> data type
  • A part of the webpage, defined by the element() function

Examples

Valid images

url(test.jpg)               /* A <url>, as long as test.jpg is an actual image */
linear-gradient(blue, red)  /* A <gradient> */
element(#realid)            /* A part of the webpage, referenced with the element() function,
                               if "realid" is an existing ID on the page */

Invalid images

cervin.jpg        /* An image file must be defined using the url() function. */
url(report.pdf)   /* A file pointed to by the url() function must be an image. */
element(#fakeid)  /* An element ID must be an existing ID on the page. */

Accessibility concerns

Assistive technology cannot parse background images. If the image contains information critical to understanding the page's overall purpose, it is better to describe it semantically in the document.

Specifications

Specification Status Comment
CSS Images Module Level 4
The definition of '<image>' in that specification.
Working Draft Adds element()image(),  conic-gradient()repeating-conic-gradient(),  and image-resolution.
CSS Images Module Level 3
The definition of '<image>' in that specification.
Candidate Recommendation Initial definition. Before this, there was no explicitly defined <image> data type. Images could only be defined using the url() functional notation.

Browser compatibility

 

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome Full support YesEdge ? Firefox Full support YesIE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android ? Edge Mobile ? Firefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android ?
<gradient>Chrome Full support Yes
Prefixed
Full support Yes
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
Edge ? Firefox Full support Yes
Notes
Full support Yes
Notes
Notes Gradients are limited to background-image, border-image, and mask-image.
IE Full support 10
Prefixed
Full support 10
Prefixed
Prefixed Implemented with the vendor prefix: -ms-
Opera Full support YesSafari Full support YesWebView Android ? Chrome Android ? Edge Mobile ? Firefox Android Full support Yes
Notes
Full support Yes
Notes
Notes Gradients are limited to background-image, border-image, and mask-image.
Opera Android ? Safari iOS ? Samsung Internet Android ?
element()
Experimental
Chrome No support NoEdge ? Firefox Full support 4
Prefixed Notes
Full support 4
Prefixed Notes
Prefixed Implemented with the vendor prefix: -moz-
Notes element() is limited to background-image and background.
IE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android ? Edge Mobile ? Firefox Android Full support 4
Prefixed Notes
Full support 4
Prefixed Notes
Prefixed Implemented with the vendor prefix: -moz-
Notes element() is limited to background-image and background.
Opera Android No support NoSafari iOS No support NoSamsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
See implementation notes.
See implementation notes.
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.

 

See also

Document Tags and Contributors

Last updated by: ninjanails,