<!doctype html> <meta charset="utf-8"> <title>CSS Scrollbars: scrollbar-width thin on the body doesn't override ::-webkit-scrollbar on 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> body { scrollbar-width: thin; } :root::-webkit-scrollbar { display: none; } /* This is so that browsers that don't implement the WebKit prefix still pass the test */ @supports not selector(::-webkit-scrollbar) { :root { overflow: hidden; } } :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 thin on the body doesn't override ::-webkit-scrollbar on root"); </script> </body>