<!doctype html> <meta charset="utf-8"> <title>CSS Scrollbars: scrollbar-width:thin on the root element</title> <link rel="author" title="Felipe Erias Morandeira" href="mailto:felipeerias@gmail.com" /> <link rel="help" href="https://www.w3.org/TR/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 { /* CSS scrollbar properties applied to the root element will be propagated to the viewport. */ scrollbar-width: thin; /* Use scrollbar-gutter to reserve space for the scrollbar. */ scrollbar-gutter: stable; } :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 type="text/javascript"> setup({ explicit_done: true }); test(function () { let root = document.documentElement; let body = document.body; let content = document.getElementById('content'); assert_less_than(root.offsetWidth, window.innerWidth, "viewport has a scrollbar"); assert_equals(body.offsetWidth, root.offsetWidth, "body matches root"); assert_equals(content.offsetWidth, body.offsetWidth, "content matches body"); }, "viewport displays a scrollbar"); done(); </script> </body>