user-select.out.css

a {
  -webkit-user-select: none;
      -ms-user-select: none;
          user-select: none;
}

b {
  -ms-user-select: element;
      user-select: contain;
}

.all {
  -webkit-user-select: all;
          user-select: all;
}

.var {
  -webkit-user-select: var(--o-select);
      -ms-user-select: var(--o-select);
          user-select: var(--o-select);
}