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+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Overflow: scrollbar-gutter on the root with overflow:auto, scrolling</title>
+<link rel="author" title="Felipe Erias Morandeira" href="mailto:felipeerias@igalia.com" />
+<link rel="help" href="https://drafts.csswg.org/css-overflow-4/#scrollbar-gutter-property" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<style>
+  body,
+  html {
+    margin: 0;
+    padding: 0;
+    border: none;
+  }
+
+  :root {
+    scrollbar-gutter: stable;
+    overflow: auto;
+  }
+
+  #content {
+    background: green;
+    width: 100%;
+    /* force scrolling */
+    height: 200vh;
+  }
+</style>
+
+<body>
+
+  <div id="content"></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_equals(body.offsetWidth, root.offsetWidth, "root width");
+      assert_equals(content.offsetWidth, body.offsetWidth, "content width");
+    }, "root, body and content have the same width");
+
+    done();
+
+  </script>
+</body>