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chromium/third_party/blink/web_tests/external/wpt/forced-colors-mode/forced-colors-mode-51.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Forced colors mode - color-scheme.</title>
<link rel="help" href="https://www.w3.org/TR/css-color-adjust-1/#forced-colors-properties">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  #dark {
    color-scheme: dark;
  }
  #light {
    color-scheme: light;
    forced-color-adjust: none;
  }
</style>
<div id="dark"></div>
<div id="light"></div>

<script>
  test(function(){
    assert_equals(getComputedStyle(dark).colorScheme, "light dark");
    assert_equals(getComputedStyle(light).colorScheme, "light");
  }, "Color-scheme computes to 'light dark' in forced colors mode, unless forced-color-adjust is none.");
</script>