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node_modules/stylelint/lib/rules/function-url-scheme-whitelist/README.md

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+# function-url-scheme-whitelist
+
+Specify a whitelist of allowed url schemes.
+
+```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 treats url schemes as case insensitive (`https` and `HTTPS` are the same).
+
+This rule ignores url arguments without an existing url scheme.
+
+This rule ignores url arguments with variables or variable interpolation (`$sass`, `@less`, `--custom-property`, `#{$var}`, `@{var}`, `$(var)`).
+
+## Options
+
+`array|string`: `["array", "of", "schemes"]|"scheme"`
+
+Given:
+
+```js
+["https", "data"]
+```
+
+The following patterns are considered warnings:
+
+```css
+a { background-image: url('http://www.example.com/file.jpg'); }
+```
+
+```css
+a { background-image: url('ftp://www.example.com/file.jpg'); }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { background-image: url('https://www.example.com/file.jpg'); }
+```
+
+```css
+a { background-image: url('HTTPS://www.example.com/file.jpg'); }
+```
+
+```css
+a { background-image: url('data:image/gif;base64,R0lGODlhAQABAIAAAAUEBAAAACwAAAAAAQABAAACAkQBADs='); }
+```
+
+```css
+a { background-image: url('example.com/file.jpg'); }
+```
+
+```css
+a { background-image: url('/example.com/file.jpg'); }
+```
+
+```css
+a { background-image: url('//example.com/file.jpg'); }
+```
+
+```css
+a { background-image: url('./path/to/file.jpg'); }
+```