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function-url-quotes

Require or disallow quotes for urls.

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

The fix option can automatically fix most of the problems reported by this rule.

Options​

"always"​

Urls must always be quoted.

{
  "function-url-quotes": "always"
}

The following patterns are considered problems:

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

The following patterns are not considered problems:

a { background: url('x.jpg'); }
@import url("foo.css");
@font-face { font-family: "foo"; src: url("foo.ttf"); }

"never"​

Urls must never be quoted.

{
  "function-url-quotes": "never"
}

The following patterns are considered problems:

a { background: url('x.jpg'); }
@import url("foo.css");
@font-face { font-family: "foo"; src: url('foo.ttf'); }

The following patterns are not considered problems:

a { background: url(x.jpg); }
@import url(foo.css);
@font-face { font-family: 'foo'; src: url(foo.ttf); }

Optional secondary options​

except​

{ "except": ["array", "of", "options"] }

"empty"​

Reverse the primary option for functions that have no arguments.

Given:

{
  "function-url-quotes": ["always", { "except": ["empty"] }]
}

The following patterns are not considered problems:

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