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chromium/third_party/blink/web_tests/external/wpt/css/css-scrollbars/scrollbar-color-012.html 

<!doctype html>
<html>
<title>scrollbar-color with transparent colors works</title>
<link rel="author" title="Luke Warlow" href="mailto:[email protected]" />
<link rel="match" href="scrollbar-color-012-ref.html" />
<link rel="help" href="https://drafts.csswg.org/css-scrollbars" />
<style>
  html {scrollbar-color: transparent transparent;}
  body {height: 200vh}
  .container {
    overflow: auto;
    height: 200px;
    width: 200px;
    background-color: red;
  }

  .content {
    height: 300px;
    width: 300px;
  }
</style>
<div class="container">
  <div class="content"></div>
</div>