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chromium/third_party/blink/web_tests/virtual/prefers-default-scrollbar-styles/scrollbars/prefers-default-scrollbar-styles/webkit-scrollbar-styles-disabled-expected.html 

<!DOCTYPE html>
<style>
  p {
    width: 8000px;
  }
</style>
<body>
  <p>
    Tests that the scrollbar styling using ::webkit-scrollbar pseudos is
    disabled when there is a preference for default scrollbar styles.
    The test passes if default vertical and horizontal scrollbars are rendered.
  </p>
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</body>