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url

The <url> CSS data type denotes a pointer to a resource, such as an image or a font. URLs can be used in numerous CSS properties, such as background-image, cursor, and list-style.

URI or URL? There is a difference between a URI and a URL. A URI simply identifies a resource. A URL is a type of URI, and describes the location of a resource. A URI can be either a URL or a name (URN) of a resource.

In CSS Level 1, the url() functional notation described only true URLs. In CSS Level 2, the definition of url() was extended to describe any URI, whether a URL or a URN. Confusingly, this meant that url() could be used to create a <uri> CSS data type. This change was not only awkward but, debatably, unnecessary, since URNs are almost never used in actual CSS. To alleviate the confusion, CSS Level 3 returned to the narrower, initial definition. Now, url() denotes only true <url>s.

Syntax

The <url> data type is specified using the url() functional notation. It may be written without quotes, or surrounded by single or double quotes. Relative URLs are allowed, and are relative to the URL of the stylesheet (not to the URL of the web page).

If you choose to write the URL without quotes, use a backslash (\) before any parentheses, whitespace characters, single quotes (') and double quotes (") that are part of the URL.

<a_css_property>: url("http://mysite.example.com/mycursor.png")
<a_css_property>: url('http://mysite.example.com/mycursor.png')
<a_css_property>: url(http://mysite.example.com/mycursor.png)

Examples

A url used in the backgroun property

.topbanner {
  background: url("topbanner.png") #00D no-repeat fixed;
}

A url loading an image as a list bullet

ul {
  list-style: square url(http://www.example.com/redball.png);
}

Specifications

Specification Status Comment
CSS Values and Units Module Level 4
The definition of '<url>' in that specification.
Editor's Draft
CSS Values and Units Module Level 3
The definition of '<url>' in that specification.
Candidate Recommendation No significant change from CSS Level 2 (Revision 1).
CSS Level 2 (Revision 1)
The definition of '<uri>' in that specification.
Recommendation No significant change from CSS Level 1.
CSS Level 1
The definition of '<url>' in that specification.
Recommendation Initial definition.

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
<url> 1 12 1 3 3.5 1
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
<url> 1 18 4 14 1 1.0

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/url