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chromium/third_party/blink/web_tests/scrollbars/prefers-default-scrollbar-styles/css-standard-scrollbar-styles-disabled.html 

<!DOCTYPE html>
<style>
  p {
    width: 2000px;
  }

  :root {
    scrollbar-color: red orange;
    scrollbar-width: thin;
  }
</style>
<body>
  <p>
    Tests that the scrollbar styling using CSS ScrollbarWidth and ScrollbarColor
    is disabled when there is a user preference for default scrollbar styles.
    The test passes if default scrollbars are rendered.
  </p>
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</body>