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chromium/third_party/blink/web_tests/external/wpt/css/css-contain/container-type-important.html 

<!DOCTYPE html>
<html>
  <head>
    <title>CSS Containers: !important flag parsing</title>
    <link rel="help" href="https://crbug.com/343249146">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
  </head>
  <body>
    <div id="target" style="container-type: size !important">Some text.</div>
  </body>
  <script>
test(() => {
  assert_equals(target.style.containerType, 'size');
});
  </script>
</html>