<p class="script-none">You do not have scripting available. :-(</p>
<p class="script-initial-only">
  Your scripting is only enabled during the initial page load. Weird.
</p>
<p class="script-enabled">You have scripting enabled! :-)</p>

p {
  color: lightgray;
}

@media (scripting: none) {
  .script-none {
    color: red;
  }
}

@media (scripting: initial-only) {
  .script-initial-only {
    color: red;
  }
}

@media (scripting: enabled) {
  .script-enabled {
    color: red;
  }
}