swc/crates/swc_css_codegen/tests/fixture/values/string/input.css

div {
    content: '⬇️';
    content: "😀";
    content: "\'test\'";
    content: "\\'test\'";
    content: "\\\\'test\'";

    content: '"string" is string';
    content: "'string' is string";
    content: '\"string\" is string';
    content: '\'string\' is string';
    content: "\"string\" is string";
    content: "\'string\' is string";

    content: '\'string\' is \"string\"';
    content: "\'string\' is \"string\"";
    content: "'test' \'test\'";
    content: '"test" \"test\"';
    
    content: "'test'";
    content: "\'test\'";
    content: "\"test\"";
    content: '\'test\'';
    content: '\'test\'';
    content: '\"test\"';
    
    
    content: "\22string\22";
    content: '\27string\27';
    
    content: "This string has a \Aline break in it.";
    content: "This string has a \A line break in it.";
    content: "This string has a \00000Aline break in it.";
    content: "This string has a \00000A line break in it.";

    content: "\"test\" \"test\" \"test\" 'test'";
    content: "\"test\" \"test\" \"test\" \'test\'";
    content: "\'test\' \'test\' \'test\' \"test\"";
    content: '\"test\" \"test\" \"test\" \'test\'';
    content: '\'test\' \'test\' \'test\' "test"';
    content: '\'test\' \'test\' \'test\' \"test\"';
    
    content: '\\\'test\\\' \\\'test\\\' \\\'test\\\' \\\"test\\\"';

    background: url('http://example.com/foo\'bar.jpg');
    background: url('http://example.com/foo\"bar.jpg');

    background: url("http://example.com/foo\'bar.jpg");
    background: url("http://example.com/foo\"bar.jpg");
}