<p class="unknown">I don't know if you're using a grid device. :-(</p>
<p class="bitmap">You are using a bitmap device.</p>
<p class="grid">You are using a grid device! Neato!</p>

:not(.unknown) {
? color: lightgray;
}

@media (grid: 0) {
  .unknown {
?   color: lightgray;
? }

? .bitmap {
?   color: red;
  }
}

@media (grid: 1) {
? .unknown {
?   color: lightgray;
? }

? .grid {
?   color: red;
? }
}