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+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Scrollbars: scrollbar-width none on the root overrides ::-webkit-scrollbar on the root</title>
+<link rel="author" title="Luke Warlow" href="mailto:luke@warlow.dev" />
+<link rel="help" href="https://drafts.csswg.org/css-scrollbars-1/" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<style>
+ :root {
+ scrollbar-width: none;
+ }
+
+ :root::-webkit-scrollbar {
+ width: 20px;
+ background-color: lightgray;
+ }
+
+ :root,
+ body {
+ margin: 0;
+ padding: 0;
+ }
+
+ #content {
+ height: 10vh;
+ width: 100%;
+ background: lightsalmon;
+ }
+
+ #expander {
+ /* force vertical scroll */
+ height: 200vh;
+ width: 300px;
+ background: gray;
+ }
+</style>
+
+<body>
+
+ <div id="content"></div>
+
+ <div id="expander"></div>
+
+ <script>
+ test(function () {
+ let root = document.documentElement;
+ let body = document.body;
+ let content = document.getElementById('content');
+
+ assert_equals(root.offsetWidth, window.innerWidth, "viewport does not show a scrollbar");
+ assert_equals(body.offsetWidth, root.offsetWidth, "body matches root");
+ assert_equals(content.offsetWidth, body.offsetWidth, "content matches body");
+ }, "scrollbar-width none on the root overrides ::-webkit-scrollbar");
+ </script>
+</body>