#function-url-quotes

Require or disallow quotes for urls.

要求或禁止 url 使用引号。

a { background: url("x.jpg") }
/**                 ↑     ↑
 *             These quotes */

#Options

string: "always"|"never"

#"always"

Urls must always be quoted.

url 必须使用引号。

The following patterns are considered warnings:

以下模式被认为是个警告：

@import url(foo.css);

@document domain(http://www.w3.org/);

@font-face { font-family: 'foo'; src: url(foo.ttf); }

@-moz-document url-prefix() {}

The following patterns are not considered warnings:

以下模式正常：

a { background: url('x.jpg'); }

@import url("foo.css");

@document domain('http://www.w3.org/');

@font-face { font-family: "foo"; src: url("foo.ttf"); }

@-moz-document url-prefix('') {}

#"never"

Urls must never be quoted.

url 禁止使用引号。

The following patterns are considered warnings:

以下模式被认为是个警告：

a { background: url('x.jpg'); }

@import url("foo.css");

@font-face { font-family: "foo"; src: url('foo.ttf'); }

The following patterns are not considered warnings:

以下模式正常：

a { background: url(x.jpg); }

@import url(foo.css);

@font-face { font-family: 'foo'; src: url(foo.ttf); }

#Optional secondary options

#except: ["empty"]

Reverse the primary option if the function has no arguments.

如果 url 中没有参数时，颠倒主选项的功能。

For example, with "always".

比如，在 "always" 选项下：

The following pattern is not considered warnings:

以下模式正常：

@-moz-document url-prefix() {}