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Contents
# function-url-scheme-whitelist
Specify a whitelist of allowed URL schemes.
<!-- prettier-ignore -->
```css
a { background-image: url('http://www.example.com/file.jpg'); }
/** ↑
* This URL scheme */
```
A [URL scheme](https://url.spec.whatwg.org/#syntax-url-scheme) consists of alphanumeric, `+`, `-`, and `.` characters. It can appear at the start of a URL and is followed by `:`.
This rule ignores:
- URL arguments without an existing URL scheme
- URL arguments with variables or variable interpolation (`$sass`, `@less`, `--custom-property`, `#{$var}`, `@{var}`, `$(var)`)
## Options
`array|string|regex`: `["array", "of", /schemes/ or "/regex/"]|"scheme"|/regex/`
Given:
```
["data", "/^http/"]
```
The following patterns are considered violations:
<!-- prettier-ignore -->
```css
a { background-image: url('file://file.jpg'); }
```
The following patterns are _not_ considered violations:
<!-- prettier-ignore -->
```css
a { background-image: url('example.com/file.jpg'); }
```
<!-- prettier-ignore -->
```css
a { background-image: url('/example.com/file.jpg'); }
```
<!-- prettier-ignore -->
```css
a { background-image: url('//example.com/file.jpg'); }
```
<!-- prettier-ignore -->
```css
a { background-image: url('./path/to/file.jpg'); }
```
<!-- prettier-ignore -->
```css
a { background-image: url('http://www.example.com/file.jpg'); }
```
<!-- prettier-ignore -->
```css
a { background-image: url('https://www.example.com/file.jpg'); }
```
<!-- prettier-ignore -->
```css
a { background-image: url('HTTPS://www.example.com/file.jpg'); }
```
<!-- prettier-ignore -->
```css
a { background-image: url('data:image/gif;base64,R0lGODlhAQABAIAAAAUEBAAAACwAAAAAAQABAAACAkQBADs='); }
```
Version data entries
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