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chromium/third_party/blink/web_tests/wpt_internal/css/css-functions/invalidation.html 

<!doctype html>
<head>
  <title>CSS Functions invalidation</title>
  <link rel="author" title="Steinar H. Gunderson" href="mailto:[email protected]" />
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <style id="sheet">
    @function --favorite-color(): color {
      @return red;
    }
  </style>
</head>
<body>
  <div id="subject" style="color: --favorite-color()"></div>
  <script>
    test((t) => {
      assert_equals(getComputedStyle(subject).color, "rgb(255, 0, 0)");
      sheet.innerText = "@function --favorite-color(): color { @return green; }";
      assert_equals(getComputedStyle(subject).color, "rgb(0, 128, 0)");
      sheet.innerText = "";
      assert_equals(getComputedStyle(subject).color, "rgb(0, 0, 0)");
    });
  </script>
</body>