.mybox {
  background-attachment: inherit;
  background-attachment: scroll;
  background-attachment: fixed;
  background-attachment: local;
  background-attachment: local, fixed;
  background-attachment: local, fixed, fixed;
  background-attachment: 10; /* Noncompliant !{Update the invalid value of property "background-attachment". Expected format: [ scroll | fixed | local ]#}! */
  background-attachment: 10, 10; /* Noncompliant */
}