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There is a newer version: 4.13


    Strings should always be wrapped with single quotes ('); single being easier to type than double on
    qwerty keyboards.

Noncompliant Code Example
.mybox {
  background-image: url("img.png"); /* Noncompliant */
}


Compliant Solution
.mybox {
  background-image: url('img.png');
}


Exceptions

    If a string contains one or several single quotes, double quotes (") wrapping can be used instead in
    order to avoid escaping characters within the string. Thus, in this case, no issue is raised.

.mybox {
  background-image: url("im'a'ge.png");
}



    The encoding value of the @charset rule must be a double-quoted string per the W3C specifications.
    Thus, in this case, no issue is raised.

@charset "UTF-8";


See

    
        Mozilla Developer Network @charset Documentation


stylelint Related Rules

    string-quotes