a {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
b {
  -webkit-user-select: contain;
  -moz-user-select: contain;
  -ms-user-select: element;
  user-select: contain;
}
.all {
  -webkit-user-select: all;
  -moz-user-select: all;
  user-select: all;
}