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chromium/third_party/blink/web_tests/wpt_internal/css/mediaqueries/display-state.tentative.html 

<!DOCTYPE html>
<!--TODO(laurila, crbug.com/1466855): Update the link when there is a spec
available. Also change the file name to not have tentative.-->
<link rel="help" href="https://github.com/ivansandrk/additional-windowing-controls/blob/main/awc-explainer.md" />
<script type="text/javascript" src="/resources/testharness.js"></script>
<script type="text/javascript" src="/resources/testharnessreport.js"></script>
<script type="text/javascript" src="/css/mediaqueries/resources/matchmedia-utils.js"></script>
<script>
  query_should_be_known("(display-state: normal)");
  query_should_be_known("(display-state: minimized)");
  query_should_be_known("(display-state: maximized)");
  query_should_be_known("(display-state: fullscreen)");
  query_should_be_known("(display-state)");

  query_should_be_unknown("(display-state: 0)");
  query_should_be_unknown("(display-state: none)");
  query_should_be_unknown("(display-state: random)");
  query_should_be_unknown("(display-state: 10px)");
  query_should_be_unknown("(display-state: 1%)");

  test(() => {
    let booleanContext = window.matchMedia("(display-state)");
    assert_true(booleanContext.matches);
  }, "Check that display-state evaluates to true in the boolean context");
</script>