scrollbar-rendered-css-color-prioritized.html

<!DOCTYPE html>
<style>
div {
    height: 10000px;
  }

  :root::-webkit-scrollbar {
    display: none;
  }

  :root {
    scrollbar-color: #007 #bada55;
  }
</style>
<div>
  <p>
    Tests that the scrollbar styling using CSS ScrollbarWidth and ScrollbarColor
    is prioritized over the webkit pseudo styling when there is a user preference
    for default scrollbar styles. The test passes if the scrollbar is rendered with
    default styles.
  </p>
</div>

chromium/third_party/blink/web_tests/scrollbars/prefers-default-scrollbar-styles/scrollbar-rendered-css-color-prioritized.html