.mybox {
  symbols: inherit;
  symbols: none;
  symbols: url(http://mybox);
  symbols: image();
  symbols: linear-gradient();
  symbols: abc;
  symbols: "abc";
  symbols: 'abc';
  symbols: 10px; /* Noncompliant !{Update the invalid value of property "symbols". Expected format: [ <string> | <image> | <identifier> ]+}! */
  symbols: 10; /* Noncompliant */
  symbols: image() image();
  symbols: image() image() image();
  symbols: image() image() image() image();
  symbols: image() image() abc;
}
